Sarafaraj Hubli

To became a professional chess player start from 4th or 5th age (if you begin early and learner grasp it quickly then he/she may pursue chess as a career). Read Wikipedia Chess prodigy. For others and adults, chess helps to exercise the whole part of Brain. Chess gives experience, different scenarios, strategy knowledge and different thinking level. So you can start to learn from any age. 

One more exciting thing I want to add here, Some player or persons may don't know that they are good at some Games or particular fields, because they never tried it. There may be lots of natural talented chess players, but they never tried it. To understand your hidden talent and mystery of our brain, I recommend you to read Wikipedia of Srinivas Ramanujan and Mir Sultan Khan(A servant, he is illiterate to European languages means uneducated to chess games but Talented Chess player who beats World Champion Capablanca and USA Champion Marshall and Akiba Rubinstein).

To play any games, you required specific training to become good at that game. Specially Technical Games required lots of practice. Ex: We thinks that cricket is a game in which we hit the ball, but cricket is a technical and skilled game. Here we have to understand the stance of the body to help in adjusting the timing of the shot. We have to play different shots for different Bowling and Bowlers, so there are lots of techniques in cricket.
Chess is, in general, has a lot of techniques to learn, even some Grand Masters don't know every technique of Top Players, so lots of training is involved and required in chess. Also, World Champion Magnus Carlsen got some training from Gary Kasparov in the past. So training is a must to become a good chess player.