Age gaps

I've started speaking to a lad who is 2 years older than me, I'm 15 almost 16 and he's 17 and will be 18 next summer. 
I've been in relationships with boys a year older but never two years, it's obviously quite a big gap at this age!
 
Would really like to know people's HONEST opinions please! I'm not sure how this age gap looks to adults/older people.. Please feel free to comment