What do you mean "outgrow". You make it sound like Hip-Hop is for kids, which isn't necessarily the case. Just like any other genre of music there are different lanes and approaches when it comes to rap (From gangsta to jazzy, to trap and so on) and a plethora of artists that rap about different kinds of subject matter...not to mention a crap load of classic albums.
I think what you mean is weather or not you will outgrow "popular" or "mainstream" rap music.... you know the whole formula of rappin' about money, hoes, cars and clothes over trap beats or pop-ish beats. In that case then I guess I have.
I find myself looking for artists (old and new) that a) rap about subject matter that is more substancial, and b) actually display skills on the mic, (instead of having simplistic rhymes and a catchy hook) instead of just bumpin' whatever is hot on the radio. Which has basically led to me bumping more underground-ish artists, or listening to old school rap music.
But if we're speaking in terms of Hip Hop as a musical artform? Then nah, I'll be bumpin' rap music well into my forties. I listen to other kinds of music as well though, but I can still see rap dominating my playlists for sure. If the mainstream fails, then I can always go back to the good ole 90s.