That's huge question in my mind. Worth spending some considerable amount of time hashing out, too. For the sake of mastery being about accruing 10'000 hours, there could definitely be a 'young master.' But in my mind, there is a sense of maturity that is only accrued the more 'real world' experience you have, the more research you've done on topics including yourself and just by getting older and living life. So. Is mastery about the 10'000 hours or about mastering your mind, body and soul as well?
An ounce of action is worth a ton of theory. Friedrich Engels