I think the biggest turn on is confidence. That's the kind of thing that only comes with age and experience. Some younger people try to 'do' confidence but its usually pretty obvious that it comes from a place of low self-esteem.
Needy people are hard work - maybe these 30-odd men have had a few girlfriends their own age or younger. Perhaps you give out an aura of genuine confidence/independence and younger men pick up on it?
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And they told me there'd be people there, whose love could make me whole. But I walked among them yesterday, and never saw a soul.