4 years i don't think is a thing to worry about. My boyfriend like you parents is about 6 years older than i and i don't feel it's a problem he sometimes asks why am i not with someone closer to my age but i love him and trust him more than anyone in my past. I do worry about when we are older cause he's older than i, and usually women i thought i heard out live men. but i try not to dwell on that cause who knows and all that matters right now is now, the future has yet to be written i don't think 4 years is too big of i gap now if it was a decade gap with adults or 30 years with adults, then idk depends on the ppl in play still. Love i think has a power