You normally have to be at least 21 years of age. Applications from younger men who are interested in becoming freemasons will also be seriously considered although the absolute minimum age is 18.
Under the United Grand Lodge of England, only men are admitted. However, there are two Grand Lodges in England exclusively for women. They are the Honorable Fraternity of Ancient Freemasons (who have a Lodge in Croydon) and the Order of Women Freemasons.