Undoubtedly great question, got me thinking.
- Yes but not really 40+ in average, probably 30 (quick learner), otherwise 35 years old. Yeah, maturity approach is heavily depended.
- 10,000+ hours = 10+ years, just for those who have zero about finance.
I know one who gets consistent after 1 year of trading, and I believe the reason is that he's very smart guy, loves math, good in finance and excel in quantitative aptitude. Logic approach is also counted and not to mention he's a true gentleman.
- Those who get bored easily will be interrupted in between unless they managed to make trades based on longer timeframe and also good in stop loss.
- you got them, they are 70 or 95% traders.