The excitement of starting a band is a defining moment for many teenagers and young dudes. The freedom that comes with cranking up that Crate amp and jamming out with your friends is unparalleled, and when you're really hitting that groove together, it's liberating and powerful. Some people keep playing music as they get older because it's a creative release, even fewer get successful at it.
Most people seem to just drop out of it altogether because they start families, get lucrative jobs doing things that their teenaged selves would be embarrassed about, become tired of struggling for low-paying gigs and little attention, or just realize that they stink at playing music. This phenomenon is referred to as "selling the van" by my friend and former bandmate Robby Harris (who co-hosts the excellent Boys podcast that Patrick and I have both appeared on).