How do I convince the guy I like that age doesn't matter?

how do I convince the guy I like (and who likes me back) that the age difference of 17 (my age in 3 weeks) and 20 isn't bad enough to stop us from dating? I'm fine with the age difference because I'm fairly mature, and the sexual consent age where we live is 16. Although apart from the fact that he's never been in a proper relationship before, he believes that I'm too young for him! What do I do?
How do I convince the guy I like that age doesn't matter?
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