I can't know a woman's sexual history...whether she's been in 3 long relationships or had 18 short ones by age 30.His fears about her sexual history? What if she's been in several serious relationships - and doesn't have much of a history? Age doesn't dictate promiscuity - personality does. Anyway, everyone has their preferences and that's cool - I just think some of these reasons are bullshyt
But on a general level...the older you are, the more relationships you've had.
That's just playing the odds.
Not saying a 35 year old woman is a slut compared to a 22 year old. But if sexual history matters to someone...the 22 year old is going to be the more attractive option (based on that 1 characteristic).
But there are, admittedly, more (and more important) characteristics that one looks for the older one is.