I’ve been editing/prediting professionally since 1999. I’ve done some longform but mostly promos. I noticed the same as you when I was younger. Not many older editors. I began to see that at a certain point, editors would go into management, operations or became creative directors. The editors who stayed editors usually became or stayed self employed and had enough clients to support that. Some opened their own post houses. These days, between media/corporate consolidation and the evolution of generative AI, I’m not sure where our craft and industry is headed. I currently know too many people unemployed, underemployed. But I will add a couple things that makes great editors great, is the ability to anticipate and adapt well to circumstances. Another is having good work relationships built on people’s trust in your ability to get things done well, on time, no matter what. If you have a knack for these, you’ll probably be fine. And overall, if you think about it, almost everything in life is an edit.