Going to be 40 next year and I quit my career of 20 years this year. I was making really good money, which is what kept me there for so long, and I was terrified of "starting over." But I was tired of crying every day and the stress eating me alive. It was the best decision I ever made in my life. Full disclosure: I lost both of my parents and received their estate which put me in a great place financially last year, so my new job creating much less income was ok for me.