Memory is a complex mental process during which several parts of the brain called memory systems are activated. The crucial attribute of the memory is its timelessness as memory connects past (experience and memories), present (our current activities) and future (planned activities). Time interval for which information is stored may differ from few milliseconds to many years according the priority of the information and readiness of the brain tissue. Information may be preserved via repetition even within short-term memory but at long-term memory it is being process via encoding and structuring. Memory changes within human’s life, the horizon of positive development is individual, depending mainly on the individual's health condition and long-term training of brain functions.