Guys, OLDER guys how would I go about convincing this guy that age is not that important. He keeps emphasizing that he's older** as if?

He's brought up his age in so many ways it's a little annoying. I have a feeling it's his way of keeping from getting too attached/attracted as in between this age-mentioning we get along very well.
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For the record I am very mature for my age - so that others think by the way I speak, etc. if we don't meet face to face that I am around 40 - and this is added to by having traveled, etc.
Guys, OLDER guys how would I go about convincing this guy that age is not that important. He keeps emphasizing that he's older** as if?
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