It definitely sounds like a crush, and perfectly normal at your age - older man who are nice to you are very attractive. If he's making no overtures to you, then he probably has no idea that you feel like this about him. No doubt he has his own circle of friends, and if he's single then a lot of older people are very happy that way. There is a huge difference in age which is not so important in twenty years time, but the outlook and understanding of the world in a man of 41 and a teenager are very different. If I were you, I would join clubs and events with prople your own age. You started this crush when you were 15, it sounds as if it's turning into a bit of an obsession and you are not considering any other likely young men. IMO - find something else to occupy your mind. Are you still at school/college? - if you are then things are likely to change when you move away after leaving education. It's good you recognise what you feel, but you are old enough to be able to do something about it, start to move on.