If your sexual market value is established at, say, the age of the Senior Prom, then, yes, that value drops over time…but that’s your value among teenagers.
At the same time, your value among 30 year olds will increase as you approach 30.
Your value among 60 year olds will increase as you approach 60.
And, of course, adults will value different things than horny teens did.
My wife’s seven years older than me, and i value her more than i ever did the cheerleaders at school.