A bit of a backstory first: I'm straight, (heterosexual, if you want to get technical) and have zero attraction towards men. I really like sucking cock, though, and I have no idea why. It's a huge turn on for me. I've never done anything more with a man, and have no interest in doing anything with another man besides sucking him off.
Curiosity got the best of me when I was 18, and I turned to Craigslist to find myself someone to suck. I posted an ad, and got a ton of replies. I only replied to a handful, and then I ended up finding one guy, who was right in my town, and that I felt comfortable enough with to do anything.
The guy was much older than me. I can't remember how old exactly, but I'd say he was in his 40's at least. I specifically wanted someone older than me, mostly as a comfort thing. I was always the shy and quiet kid, I was socially awkward, and just felt like I'd be more comfortable with someone that was older.