My answer sides on I like variety.
I wouldn't want to just serve or target a certain age group. Each age group and generation has its benefits. A little of this, and a little of that, then a sample of that over there, and I get a full balance of satisfaction on each level.
I don't care how young as long as he is legal and respectable. (I have asked for ID in this case, actually as a joke, and was surprised it was provided) Not everyone in a specific age range is the same. Besides a mamas boy who likes and desires older women, can be just as respectful and endearing as any man in his 40's, 60's or 80's. More so sometimes. Being the forbidden fruit he gets to taste now that he is legally of age. The appreciation alone can be intoxicating.
Someone my own age, I can relate to, is also a pleasure, we are at similar stages in life. The energy is familiar.
My master is older, not by generations but he's closer to 50. So obviously my personal preferences don't lean to younger for a relationship. But people at any age can be fun to play with. I'm not there to build our future. I'm there for us to bond and enjoy our time together in the moments we have them.