Of course creativity changes: The older one gets, the more one learns about a variety of topics and the more life experience one has. This is precisely the reason I tell folks to make sure to learn about different things, meet different sorts of people, and step out of one's comfort zone from time to time. I think this is why drugs - especially hallucinogens - are popular among some artists (and scientists that need some creativity). Drugs give experiences of different ways of thinking.