Just as no plumber would want to read a comic book exclusively about his profession, of course adolescents aren't primed to read only in their age group, or exclusively about characters who are going through the selfsame torments and triumphs.
While there may be room for the coming of age and first love in a comic book story, the younger reader is as likely to be captivated by saucers and sorcerers and so forth. If the comic reader (certainly the comic collector) has aged, then it is also true that publishers did once note the audience drop off as their readers bought their first car or started dating and so, the fact that characters and storylines range across the divide, suggests that this has not been an issue for teen readers. At various times they would have read and enjoyed:
and snuck furtively into big sister or brother's room to peruse their copy of Omaha the Cat Dancer