guy help!!!

Holly
I've liked this guy from the beginning of September, he's super lovely, a gentleman and we get on super well. 
Only problem is he's just 23 and I'm 17, 18 in a few weeks! (Not illegal where we live). 
I feel it's pretty obvious he likes me, we talk often and it's always flirty and sometimes in a sexual manner.
 I know, however that he is uncomfortable with me being young as although he hasn't told our friends he likes me, he's mentioned the fact it's sad I'm so young.
 Do I tell him now and perhaps wait until I'm 18 for us to act on it and let him know I'm ok with that?
 Do I wait until I'm 18 to tell him? 
Do I not tell him at all as 5 years is too big an age gap? 
If I should ask him!! How? I need to seem mature. Thank you !!

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