the Age of Maturity according to Gurdjieff

From this time on, that is, from the moment the process of his development is finished, a man becomes personally responsible for all his voluntary and involuntary manifestations. According to laws of nature elucidated and verified through many centuries of observation by people of pure reason, this process of development is finished in males between the ages of twenty and twenty-three, and in females between the ages of fifteen and nineteen, depending on the geographical conditions of the place of their arising and formation.

Meetings with Remarkable Men / Chapter "My first Tutor"

consequences of sex before adulthood

Gurdjieff also insisted that achieving an orgasm before reaching adulthood had serious consequences on an adolescent’s mental development: “If even once the sensation of the climax of what is called the ‘Ooomonvanosi process’ occurs in what is called the “nervous system” of their children before they reach majority, they will already never have the full possibility of normal mentation when they become adults.”

Gurdjieffs Sexual Beliefs and Practices

Concerning sexual desire, he once told me the following: "If a youth but once gratify this lust before reaching adulthood, then the same would happen to him as happened to the historical Esau, who for a single mess of pottage sold his birthright, that is, the welfare of his whole life; because if a youth yields to this temptation even once, he will lose for the rest of his life the possibility of being a man of real worth."

Meetings with Remarkable Men / Chapter "My first Tutor"