I decided it’s okay to post photos of your younger selves because they are all photos of YOUR SOUL. Many of us look out through our eyes with the self of our 20s.
(Remember that people in some cultures forbid photos of them because they think the photo is "capturing their soul?")
Strangers visiting a website don't care. I think they want to see somebody, hopefully interesting.
A lot of accounts of departed spirits that "come thru" manifest in a younger version of themselves. Somebody is picking their favorite version!
There is a romance to our pasts. Many of us don't know what our later-life friends looked like as a young person. It's nice to get a view of the young, idealistic, hopeful self, embarking on adult life.
The photos are all our “self” and our SOUL. Quantum physics says time is not linear. We can be our early and late selves at the same time.