Age differences?

I'm curious about the age differences of people in relationships on here. My boyfriend and I are 5 1/2 years apart, 23 and 18 respectively. I just want a different perspective on other peoples age gaps because, at my age, it seems very uncommon that I'm dating someone who is a few years older than me. I'm not saying that it's bad, especially since I'm really happy with him, but again I'm just curious.