OK, I believe I have a bit of experience in this age gap situation. Now your circumstance is somewhat different than mine so I will have different advice for you than the outcome of my circumstance. You are 16 years old and possibly yes where you live that is legal consent to date someone much older than yourself. That maybe true, but have you even finished your primary education yet while this man you have a crush on is probably stable in a career. The next thing I would offer to you is you say this is a crush and that is all fine, but is this something you would actually pursue? A crush from afar is innocent and nothing wrong with that at all, but pursuing him would really effect his life a lot.
Now onto why I say I have quite a bit of experience in this area. When I was 20 years old and I will be turning 22 in the beginning of August I met a guy while at an Art Museum where a painting of mine was being exhibited. We talked about Art for quite some time and I really didn't even realize he was quite older than myself until we were about to leave that evening and he gave me his phone number. He is approximately 30 years older then myself. So we continued to hang out as friends and his love of Art and my love of Art led us to really spending a lot of time together. Several weeks after the Art Museum meeting we had our first real date and haven't turned back since. I am currently 21 years old and going to be 22 on August 8th and he is 51. I now live with him at his place and we couldn't be happier. So it does work this whole age gap thing , but I think both participants really have to be more mature and have something in common like we both have. Sorry for the long post.