Shud i meet a guy who i met through an internet dating site?!?

Any tips for internet dating? Im spose to be meeting a rather nice guy tonight.. the only thing is we met on an internet dating site.. and its kind of putting me a little bit off at the mo. Hes 28 and im 22 , should i go or shall i back out? ive never been out with ne one whos usually 5+ years older than me?! help !
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