Am I too old to be an experiment?

I'm a 24 year old bi guy and I have a bit of a fantasy of just chilling with a straight guy chilling and maybe getting to a point of messing around.

But is this something that happens a bit older? Or is it over by this point. Will this remain a fantasy?

It'll never happen meeting people online I think as at this point people anyone will just put “straight” to get interest.