Most of our parents have higher differences between their ages than this, back then it wasn't a big deal, why would it be now?
My father was 26 when he started dating my mom, he had to wait 3-4 years before she turned 18 so he could finally start dating her (Hint, he's 8 years older). It's just 5 years in your case, it's nothing.
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Best LPer ever, Gix ! : http://www.youtube.com/watch?v=Vt5YKmP7ecY