Well I'm only in my twenties so no sign of me putting a stop to wearing Speedos anytime soon. My father's just entered his fifties and I don't think I've ever seen him wear shorts to the pool or beach, so here's hoping I stick with the Speedos for as long as he has, at least.
He even changed his Facebook profile to a photo of him on holiday in Speedos recently! Not all of the comments were pro-Speedos, but he did get a few likes.
Screenshot:
http://i.imgur.com/05BDZWc.png