That ain't my job.
You are thinking about this like a guy.
Guys are very much attracted to a woman's biology and often guys are very visual-orientated with what turns them on.
Women are not this way.
They are attracted to other things beyond the superficial visual characteristics, such as: success, power, ability, confidence, height, size, strength (mentally and physically) etc. etc.
It's more about who you are, what you are, and how you act, rather than how many abs she can count on your stomach.
It goes back to the caveman times.
A woman is instinctively attracted to men who can provide for her and protect her.
Men are instinctively attracted to just about any healthy, fertile vessel that can carry their sperm. Her physical appearance tells our inner caveman that she's fertile and ripe.
This is not so important for women. If she loses attraction to you, it's not cos of what you look like, its cos of what you have done (or not done) or how you carry yourself.
For this reason men can actually age like wine, whereas women cannot.