I could fantasize and say I was 10, but I regret and am somewhat embarrassed to say that the truth is I was 27 , from my first boyfriend. By the time I was half that age I was sticking everything from screwdriver handles to soda bottles (the old glass kind with the long smooth neck) to hot dogs in my ass while jerking off and would have happily gave it up to a cock if given the opportunity. Unfortunately that was a different era, pre-Internet with most gays well hidden in the closet. For an already shy boy in a small town with a small family, that was the kiss of sexual death.
I played the 'you show me yours and I'll show you mine' touchy-feely game with the son of a family friend a few times when I was 9-10, and wished then and now that he had wanted to do more and more often, but I only saw him a few times over a couple of years so it wasn't meant to be, and not much happened with a live human between then and the 'big event'.
I really envy those growing up today that can get online and discretely find each other when they're horny and want to fuck. I'm sure if I had the Internet back then I would have moved from improvised dildos to cock many years before I actually did.
Even more satisfying is that now the ones that get boned about taking or giving poz loads can meet like-minded guys on sites like this and (1) admit it, (2) discuss and get comfortable with it, and then (3) work towards their mutual goals. When given the chance I'm always willing to encourage the young guys of today to make their dreams cum true.