Babybeel's Things

I know this has been asked before but I'm genuinely curious, suppose if two people A and B are 12 and 15 when they start dating and they've been dating throughout their adolescence. B will experience high school and college first and they mature faster obviously and i feel like this time period is very fast paced everything changes a lot in a short period of time.
do you think it's okay for B to continue dating A when B reaches adulthood? like when B is 19 or 20?

For me, Korean authors really need to cut down on the timeskips and "oh they knew each other all along from childhood, they're meant to be". Like it takes away from the relationship they build in current time. Turns me off so much I crash out whenever i see these two.