My DH is 13 years older than me. He's not the least bit controlling (someone up-thread seemed to hint at a corellation there) - in fact, he is way more laid back and if anything, I get cross with him for that!
As far as being from different generations and therefore having nothing in common - I don't know, I think you'd have to have pretty shallow interests for this to be the case! DH and I love films and literature and music, and have pe plenty in common there. We love getting pissed, so we have that in common. We love going to gigs, and sometimes he introduces me to bands and sometimes I introduce him to bands, and that's great. Our friends are mosly younger than DH, mostly my age, and most people think DH is far younger than he is. We have similar political and social views. I can't think of many times than our differing generations have really been an issue...
I do worry about being alone when I am older, but honestly I know that could happen no matter who I chose, and I try to focus instead on the fact that we still have plenty of years together ahead of us. We have a baby DD and he's a very, very involved and active dad.
He needs more sleep than I do, and he's not as bothered as I am about the fact that we have a wee baby and so can't go out as often as we used to.
I have more fun with DH than with the younger guys I dated before him.
If he's right for you, he's right.