There was a story I read somewhere about a well known recording engineer famous in jazz circles. He also teaches at a local university.
He says, when he begins a semester the first thing he asks his students is what type of music they want to work with - R&B, rock, pop, rap, classical, jazz, etc. Every semester he gets nobody raising their hand for jazz.
He says based on this he expects to be working full time well into his 70's.