Yeah, I dont' think it's so much one's age but how many years of experience one has under one's belt that should be of interest. I seriously doubt those over 55 will ever blow up, provided that they've done this long enough. Not that they can't, but hopefully they have enough experience (and maturity) to know how to avoid it.
You are correct, in my case I hardly make trades any more, but with automation and staff of six allows me to travel. In all the decades I manually traded to get good and build my accounts, never took vacations or time off, at my age now, I want to see what I missed with last wife. I only trade futures, options on futures and stocks and long term forex. Still do scalping and hourly futures trading, own seats to keep fees low, I will never close up shop, gave up too much in my life to get good. Most traders never get to point of trading is a real business.
ie majority of the traders are old old, and introverts. Either the traders started when they were small boys, or they started after retiring from their full-time jobs. This survey didn't attempt to ask this question. It makes sense for introverts and not extroverts to be traders as most of the time, we will be talking to the machine charting software trading platform forum
OP was hoping that atleast 50% are in the 18 -34 age group. The bread and butter for indicator vendors are the under 30s
Age has no meaning in trading, in fact, if you are very old and retired the least you want to do is trade about and have some fun with that retirement money just to get things exciting again.