[jderiksen]

> Is this normal, possibly due to aging for some people?

Yes, possibly. When I worked 40 hours / week I had very little energy or interest in creative pursuits as I approached my 30s. This is part of the reason that I work 30 hours / week now.

> Or is it because all my curiosities have been solved...

This may very well be the case. I love music and pursue it with great energy but as I learn new styles, new instruments, try new ways to perform, etc. I find less and less satisfaction and magic. I still find enough in it that I continue to pour a lot of time and energy into it.

> ...or could it be a symptom of chronic depression as I pretty much don't have craving for anything anymore?

This could very well be the case. If you haven't talked to a good therapist I would recommend doing that.