Two things to consider for me.
At university and high school there is the so called 2 year rule that everyone follows where you can't go out with anyone that studies 2 years below or above you.
Then after that i'd pretty much have a 5+ or - age difference. Anymore then that and you'll probably run into problems. Such as conversation, and different views on things such as kids blah blah becasue of the differently levels of maturity.
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