I am in my early fifties. For the past year, I've been hanging out with a 21 year old guy, mutual interest in playing soccer. I resisted going further, but he pressed pretty hard. I am his first guy, he has no daddy issues, and it's going great no drama. He thinks I am super hot, I think the same of him, we have a great time in and out of bed. But that is definitely the widest age gap I've experienced.
Edit: I forgot to include the widest spread for me going the other direction. I was 22, racing sailboats out of Annapolis. I was staying at a cheap cheap motel, with a bunch of guys. At the BBQ on Saturday night, I met another guy who was racing, totally sexy, older guy, married. Somehow it was instant attraction, we went back to my motel room and I got fucked for the second time in my life. Turned out he was 45+, but super hard body, great kisser, and an awesome top.
So my range is 23+ years older, and 23 years younger. And everywhere in between.