I would not assume it is just the young. I know for a fact that in our denomination that it is not. It crosses all age ranges, even up to retirees.
I can only speak for myself, but at a certain point I started to notice that young ladies were looking too much like my daughter for me to think of as “attractive”.
That is beginning to include ladies in their early 20’s at my job.
I guess my journey into fogey-ism continues unhindered...