How old is Ginny when she has children?

In the "Harry Potter" series, Ginny Weasley has three children with Harry Potter: James Sirius, Albus Severus, and Lily Luna. According to the epilogue set 19 years after the events of the last book, Ginny is around 36 years old when she has her children. This timeline suggests she likely had her first child, James, in her mid-20s.