And it's a legal requirement for the game for all characters in games engaging in sexual conduct like what Sophia does in the second side job to be above the age of 18. Dylan obviously isn't, otherwise L&P wouldn't need to state Dylan's age as 1X.
And it doesn't matter if you believe the statement about the ages of the boys. I obviously, don't. They look and act as if they're only about 12.
As I've said before, it's the basic Pub Test. Without knowing the context, go to anyone in a pub and ask them what age they think those boys are. No one would believe they're 18, as they're legally required to be.