For women there is an issue of having low bone density that cannot be fixed after the mid twenties IIRC from reading an exercise physiology textbook. Your aerob

For women there is an issue of having low bone density that cannot be fixed after the mid twenties IIRC from reading an exercise physiology textbook. Your aerobic capacity that can be seen as an approximate proxy for general physical health can be maximized by your thirties and can stay close to that with maintenance until your 70's and beyond.