I'm sure not all traders will agree with me but some could possibly be on my side...
This is a subjective opinion. Obviously, you have not heard of Irving Kahn, a trader who actively traded on the stock market at the age of 109 and who holds the record for this indicator. So age is not an obstacle to trading, as each person is different.
In my opinion, trading may not be subjective but can be a chosen career or profession, and normally, it is a choice to anyone. However, i think that trading can be a life time job, looking at your example, the man that traded stock up to the age of 109, this should be a lifetime career or job as I have said earlier.