Well, usually I am pretty optimistic but on this topic not so much. With 29 years old I am pretty young for a jazz fan. And its not a good thing that this is a fact. At jazz concerts, at jazz vinyl/cd stands on a fair I feel truly out of place. With small exceptions I am always the youngest. I don't think the average age attending these kind of things is 55 years old, it is probably more like 65 years old. The fact that David Murray could not even fill up half a Bimhuis, and Atomic couldn't even fill up a quarter.... All worying things I have witnessed.
On the other hand I sometimes do see some hopeful things A kid from my tutor class (a high school class in the 16-17 age section) was listening to Coltrane making his test. Reminded me of myself, listening to Coltrane's Giant Steps while attending incredibly dull French lessons.