Probably yes. As I move forward in life, my free time is dwindling faster than I like. Work responsibilities and other fun stuff seeps in.

I'm not complaining most of the time, but sometimes I want to be able to spend a day working mindlessly on my computer to try new things and fool around.

Free time is one factor but other factors include declining health (people that have lived the touring lifestyle understand how harsh it can be physically) and dying. Add in children and the complications of having a 10 year old listen to Cannibal Corpse with you as a hypothetical situation.

One other factor not commonly mentioned is that many people ossify and have difficulty expending the mental energy to seek out new music. I personally don't do that anymore but I certainly did for a while when I was much more stressed out with work. Additionally, some genres themselves seem to get into a rut and tap out (let's not forget the "punk's not dead" attempts at denying reality, for instancee)