According to the CDC, the average age of first-time moms today is 27.5 years old, while the average age of first-time dads is 30.1 years old. However, there's no hard and fast rule about the right age to have a child - some people welcome children when they're over 40 years old, while others are young adults. Plenty of celebrities have fallen on the younger side of the spectrum. In August 2025, Millie Bobby Brown and husband Jake Bongiovi announced that they had welcomed their first child via adoption. Brown was just 21 years old at the time, while Bongiovi was 23. "We are beyond excited to embark on this beautiful next chapter of parenthood in both peace and privacy," the couple's joint Instagram post read. Keep scrolling for more on Brown and Bongiovi's announcement, plus other celebrity couples who became parents at a young age: