Marriage at 13 is a bad idea.

Just look at Romeo and Juliet…

–  Women who were first married by age 18 – Our World in data: https://ourworldindata.org/grapher/women-married-by-age-18?year=1985

Marriageable age – Wikipedia: https://en.wikipedia.org/wiki/Marriageable_age

The 1962 Convention on Consent to Marriage, Minimum Age for Marriage, and Registration of Marriages – Wikipedia: https://en.wikipedia.org/wiki/Convention_on_Consent_to_Marriage,_Minimum_Age_for_Marriage_and_Registration_of_Marriages

Wedding scene – Romeo + Juliet (1996) 

Download CSV file containing all data used on women married by age 18 : https://ourworldindata.org/grapher/women-married-by-age-18?overlay=data