The truth is that the Canadian rock band Rush is the same as that I am, and wow, that’s really not young anymore.
An older fan brought to one of their gigs. It was the 1980s and the older one, had become a fan in the 1970s.
Recently online, I saw some new fans, 21st century teen fans mostly. Some people’s kids like the band and become fans in their own right. Once one gets to know what is going on, people can learn more about how to gauge a fan’s age group if it is not immediately obvious, by asking which album made them a fan. Despite being a very unusual person in some respects, I became a fan with their best selling album/cd of the 1980s Moving Pictures “just like everybody else”.
One fun thing about being a fan of such a long time band, is that one can stick with it for decades or can even go away from them for a while and then come back, refreshed by how they have changed their sound etc..