Probably around the time they settle into a familiar routine, or where other obligations overtake the curiosity and explorative elements of music. I can't imagine it's a lot of fun using your free time taking chances on new bands or styles when you've got a 1 year old child, or a new house to pay for. As for specific age points, I'd say probably anywhere from 28-35 is where you'll see most people settling into this kind of routine.
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