Has it ever occurred to you the man was sleeping with you BECAUSE you were in your 20s and you were a huge ego boost for the guy?
I don't think there is any indication in the description that the member gave of her relationship with an older male -that he was in any way narcissistic, or using the relationship to feed a grandiose ego. that is only one (very dark) interpretation of the many possibilities for why they got together.
As the older male who didn't make a move - I'd have seriously gone for that woman if she had been my age. She had an amazing personality, very warm, very clever, and also adventurous.
I would actually like to have had an ongoing friendship with the young woman - and may yet achieve that, and yes, it has been a big wakeup and boost to my very limited confidence that someone with her qualities appeared to find me attractive - regardless of her age.
as for a romance, I still haven't sorted through whether it is my own sense of inadequacy which had me isolate away from a younger partner 20 years ago - or whether (as I thought at the time) she'd outgrown me and I should just get my shit out of her way...
a bright young person in their late teens and early twenties is still growing up and changing rapidly
I guess even that growing up isn't necessarily limited by age - we certainly grow when we get into therapy, and I've seen that happen very clearly with people here.