Don't do it. That is extremely dangerous--pretty much without exception, a guy that old who's interested in dating a 14-year-old is a pedaphile and does not have "honorable intentions." Plus for you to have a sexual relationship with someone over 18 is illegal...they would be considered guilty of rape even if you gave your consent.
Especially on a dating site. Those places are a breeding ground for creepers, especially if you're young.
My advice would be to stick to people under 18, whom you meet in person (i.e. school, clubs, etc), not over the internet or a dating service. When I was your age I wasn't very interested in the other 14-year-old boys, but I did have a crush on a good number of 15 and 16 year olds...and when I got a little older I even had a crush on this guy who was 8 years older than I was. But I knew him personally...my whole family had known him for like 8 years, and a lot of people I knew and trusted had known him his whole life.
Also, dating older men is like 500 times more dangerous if your mom doesn't know. Really dating ANYONE is lots more dangerous if your mom doesn't know. What if something happened to you, and your mom didn't know where to find you or didn't know you could be in danger?
Good luck!
SamIAm