John Lennon died at the age of 40, after nearly two decades of unprecedented success as a musician. He’d been a creative person all his life and was able to make a career out of it. He said that, in many ways, he was using his creative career as a way to avoid maturing. Lennon didn’t want to age, but he was exhausting himself with his ways of preventing aging. By the time he was in his mid-thirties, Lennon decided that his method of maintaining immaturity was not working for him.
Source: Emma McKee/cheatsheet.com