The SKILL of TGM is exactely like the Sexual experience. Now I am sure about it. When you are young, between 16 and 24 years old, you can play 3-4 hours in a day, in being even quite efficient if you can manage your pauses and sessions. BUT your technics and accuracy SUCK, your style is not noticable, you have a brutal reserve of energy to bruteforce the game but you miss the style of the Old Masters... ALL you have is endurance, and infinite will to improve. When you are more than 30 years old, your knowledge of the game is beautiful and complete, your style is recognized by young players, you have a huge datalist of experience which allows you to be a deep strategy maker... EVEN younger players who finaly passed your personal best, they continu to consider you above them, just because of respect... Unfortunately, your hands starts to be rusty, you can feel some little pains in your arms that you did not have before, and you play nicely no more than... 1 hour in a day. When you were between 16 and 24 years old, you could have sex for 6-7...10 times in a day for some crazy dudes.. But admit it, that was CRAP, you would kick your own face and mock yourself if you could observe you fucking 10 years ago... Then you are 30,32, almost 40 years old.. You became a confident and accurate artist of sex, but unfortunatly, you can do this 1 or 2 times in a day.... 2 theories are in my mind, and I would need a lot more of reading to conclude about this... The first idea is that our whole body is just getting more rusty, time after time. The neurones containing knowledge are stockpiling in a definitive structure which doesn't allow more new network for new developpement.. Only stockpilling of the existing base, but nothing new anymore.. The second idea is that ONLY the serotonin is "dying". These synaspes which maintain us alive and produce our interest for things, is decreasing slowly whatever we do (searching for new passion...), until we accept death around 75-85 years old..