Marriages at young age is being looked at as an evil, however it's not. Historically, scientifically and according to religions the problem is not in young age marriages. Marriage at young age will protect children from causal sex realted abuse instead of having them exposed to a great evil.
Prevalence of Sexual Initiation Before Age 13 Years Among Male Adolescents and Young Adults in the United States
https://jamanetwork.com/journals/jamapediatrics/fullarticle/2730066
First sexual intercourse will occur for approximately one third of teens (13-16)

source: https://www.stopitnow.org/ohc-content/age-appropriate-sexual-behavior
In 2020, Alabama 25 kids between the age of 10-14 had abortions. One child was 11, and another one was 12, according to the Alabama Center for Heath Statistics. Alabama implemented a total ban on abortions with no exceptions for rape or incest.
https://www.businessinsider.com/thousands-of-kids-under-15-get-abortions-every-year-data-2022-7
However, that 2.5 percent represents 188 minor girls receiving abortions of which 60 were under the age of 16, the age of consent in Alabama.

https://www.statista.com/statistics/1307679/legal-abortions-ratiowomen-in-the-us-by-age/
Masturbation becomes goal-driven around age 10. Boys in particular are trying to get to the point of orgasm, and at around 11 or 12, they may start seeking pornographic material. "Parents need to be careful about what kids can access online," Swanson says.
Source: https://www.webmd.com/parenting/features/caught-your-kid-masturbating
You’re not too young to masturbate. Masturbation is a perfectly healthy activity at any age.
Babies explore their bodies and learn quickly that touching their sex organs feels good. It’s not at all unusual for young children to masturbate. Often parents will stop them from doing it in front of other people, but many children continue to masturbate on their own. In fact, experts recommend that parents teach children that it’s normal for people to touch their sex organs for pleasure — but that it should be done in private.
https://www.plannedparenthood.org/blog/im-12-and-i-masturbate-am-i-too-young
https://www.plannedparenthood.org/blog/is-13-too-young-to-masturbate
In fact, more than half of 14-year-old boys admit they've masturbated. That means at least one out of every two of your guy friends has done it -- even if they won't admit to it. (About half of the girls in your class are doing it, too.)
https://www.webmd.com/teens/masturbation-faq
Touching/masturbating genitals in public or private is among Common, normal behaviors in Children Aged 2 Through 6 Years

National Society for the Prevention of Cruelty to Children.
9- to 13-year-olds, During these ages, children begin to get more curious about sex and relationships. They may start to be attracted to other people. Examples of typical sexual behaviour during this stage are:
..
- masturbating in private
https://learning.nspcc.org.uk/child-health-development/sexual-behaviour#skip-to-content

https://www.unchainedatlast.org/united-states-child-marriage-problem-study-findings-april-2021/
Data shows that between 2000 and 2018, more than 300,000 minors (i.e., under the age of 18) were married in the United States, most of whom were 16 or 17 years of age. Some of these marriages included girls as young as 10 and girls who were married to men that were decades older.
https://www.tahirih.org/news/child-marriage-prevention-act-of-2024/
In 14 states (and Washington, D.C.), clerks acting on their own – without judges – can issue marriage licenses for all minors: Alabama, Florida, Idaho, Maine, Maryland, Missouri, Nebraska, North Dakota, Oregon, South Carolina, South Dakota, Tennessee, Vermont, and Wisconsin
Texas Penal Co Sec. 22.011. SEXUAL ASSAULT.
(e) It is an affirmative defense to prosecution under Subsection (a)(2):
(1) that the actor was the spouse of the child at the time of the offense;
https://statutes.capitol.texas.gov/Docs/PE/htm/PE.22.htm#22.011
https://www.youtube.com/watch?v=xPfEkDIZI-M
Before 1929, Scots law followed Roman law in allowing a girl to marry at twelve years of age and a boy at fourteen, without any requirement for parental consent.

It is reasonable to look at the practices of ancient Judaism for cultural considerations on the proper age for marriage. According to tradition, boys were not considered “men,” and therefore not marriageable, until the age of 13. Girls were not considered “women” until age 12. These ages more or less correspond to the onset of puberty. While those ages might seem too young to us, they are not unusual ages for getting married, historically. It has only been within the last century or so that the average age of getting married has drifted into the late twenties and early thirties.
source: https://www.gotquestions.org/marriage-age.html
The Bible does not tell us exactly how old Mary was when she gave birth to Jesus, however many historians use clues in Scripture to estimate Mary's age to be around 15 years-old when she had Jesus.
During this time in history, Jewish girls would have been betrothed (engaged) to their husbands as early as the age of 12 years old. Scholars believe Mary would have been somewhere between 12-16 years old when she had Jesus.
Source: https://www.christianity.com/wiki/holidays/do-we-know-how-old-mary-was-when-she-had-jesus.html
Many rabbis, even during Jesus’s time, taught that eighteen was the ideal age for marriage for a man but certainly not later than twenty-four. He knew too that girls were ready for marriage as soon as they were physically ready to conceive and bear children, which according to the law was twelve and one-half years. Mary, the mother of Jesus, was probably no more than fourteen years old when she gave birth to the Son of God.
Source: Rev. Dr. Eugene Weitzel stated this about the Jewish view of early marriage
https://biblicalgenderroles.com/what-is-the-minimum-age-for-marriage-according-to-the-bible/

Source: https://www.sefaria.org/Niddah.44b.10?lang=bi&with=all&lang2=en
The Rabbis recognized in males a stage similar to that of the ḳeṭannah. A boy nine years of age was regarded as being of a nubile age, so that if he had illegitimate intercourse with a woman forbidden to him she would be liable to punishment, although he could not be punished until he reached the age of maturity—thirteen years and one day (Nid. 44a). His marriage, however, was not valid (Ḳid. 50b; "Yad," l.c. iv. 7),
https://www.jewishencyclopedia.com/articles/10861-minority#anchor3
If the marriage was contracted for the girl before she had reached the age of six, or after that agewithout her consent, the formality of mi'un was not necessary. If the marriage took place with her consent when she was between the ages of six and ten, mi'un was necessary if she showed signs of intelligence and of appreciation of the symbols of marriage. After ten, mi'un was necessary even if the girl manifested no signs of intelligence (Yeb. 107b; Giṭ. 65a; "Yad," l.c. xi. 7; Eben ha-'Ezer, 155, 2).
https://www.jewishencyclopedia.com/articles/10888-mi-un
Can. 1083 §1. A man before he has completed his sixteenth year of age and a woman before she has completed her fourteenth year of age cannot enter into a valid marriage.
https://en.m.wikipedia.org/wiki/Marriage_in_the_Catholic_Church

Source: https://www.cpr.org/show-segment/child-marriage-common-in-the-past-persists-today/
On 31 October 1396 Isabella of Valois, daughter of King Charles VI of France married King Richard II of England. She was six and he was 29. Of course, it was fully understood that the marriage would not be consummated until she was 12, by which time she was a widow.
It was permissible and fully legal for children below the age of consent to marry in the Catholic Church provided they had a papal dispensation. Such dispensations were granted mainly for diplomatic reasons. It is thus entirely plausible that an 8-year-old princess might marry an 18-year-old prince.
Within the Catholic medieval world marriages would be valid after the age of puberty (12 years of age for girls and 14 years of age for boys). However arranged marriages were permitted at times and with permission of the Church and the parents involved, especially in families of nobility were concerned. The minimum age for a dissoluble bethothal was 7 years of age
In 2020, the teen birth rate was 15.4 (births for every 1,000 females ages 15-19), down eight percent from 2019 and down 75 percent from the 1991 peak of 61.8.1 There were 158,043 births to females in this age group, which accounted for less than five percent of all births in 2020. And given the age of these mothers, in 2020 nine in ten (91.7 percent) of these births occurred outside of marriage.1 The teen birth rate has declined to a new low each year since 2009.1 Still, the teen birth rate in the United States remains higher than that in many other developed countries, including Canada and the United Kingdom.2
Wikipedia had a list of yougest birth mothers but it was removed. However you can access the archived version on different sites and on the Internet Archive website:
Many of those girl had a normal birth and the youngest one was Lina Madina which she gave birth at the age of 5.

The birth rates for teenagers aged 15–17 and 18–19 in
2015 were 9.9 births per 1,000 for the younger teenagers and
40.7 births per 1,000 for the older teenagers, down 9% and 7%,
respectively, from 2014 and record lows for both groups. Since
2007, the rates for these two groups have fallen 54% and 43%,
respectively, and have fallen 74% and 57% since 1991. The birth
rate for teenagers aged 10–14 declined in 2015 to 0.2 births per
1,000 females from 0.3 in 2014, the lowest rate for this group
on record.
https://www.cdc.gov/nchs/data/nvsr/nvsr66/nvsr66_01.pdf
The 2022 birth rate for teenagers ages 15–17 was
unchanged at 5.6 births per 1,000 females; the rate for those
ages 18–19 was 25.8 births, down 3% from 2021 and another
record low. Rates for these age groups have fallen 74% and
64%, respectively, since 2007, and by 85% and 73% since 1991.
The birth rate for females ages 10–14 was unchanged in 2022 at
0.2 births per 1,000 females.
https://www.cdc.gov/nchs/data/nvsr/nvsr73/nvsr73-02.pdf
Among them are:
Links: