Currently, the average age for a person to become a first-time mother in America is around 26 years old, and the average age of a first-time American father is about 31 years old.
However, one thing that plays a big factor in age is geographical location. First-time parents tend to be older in big cities and on the coast, and they tend to be younger in rural areas and in the South.
All that being said, if you are in your mid-30s or older and may want a child one day, don't stress! You can still have a healthy pregnancy and baby.