"Age is just a number"

I'm sure this sounds silly of me but I'm 20 and I've recently started talking to this guy and he's extremely cute and energetic and for some reason I figured he was my age, but i recently learned he's 18, about to be 19. I know it's not a big age difference but I've never kissed or even liked a guy younger than me. Do any of you have stories you could share about dating or being with a younger person?