This is interesting:, and especially important for snooker:
"Just as you may not run as fast or jump as high as you did as a teenager,your brain’s cognitive power—that is, your ability to learn, remember, and solve problems—slows down with age. You may find it harder to summon once familiar facts or divide your attention among two or more activities or sources of information. These changes affect your ability to focus, so you may find yourself getting more easily distracted than you were when you were younger.
"As you age, it takes longer to absorb, process, and remember new information. The natural loss of receptors and neurons that occurs with aging may also make it harder to concentrate. Therefore, you not only learn information more slowly, but you also may have more trouble recalling it because you didn’t fully learn it in the first place. With slower processing, facts held in working memory may dissipate before you have had a chance to solve a problem.
"In addition, the ability to perform tasks that involve executive function declines with age. Many people learn to compensate for these changes by relying on habit most of the time and devoting extra effort to focus on new information they are trying to learn."