I said he didn't look old enough to be his father not that he wasn't old enough, it's probably a case of Pegg looking young for his age and Quaid looking old for his age. However like I said it's not completely immersion breaking (like the Starlight and Deep/Maeve issue whenever she mentions growing up idolising them) though it is funny that most people who hadn't read the comics thought they were flatmates until he called him dad xD
Maeve is likely mid to late 30's, Homelander too. Deep is probably early 30's and if Starlight is either very late teens or early 20's then a decade isn't a lot.