I'm 91 and the oldest working female comedian. Here's what I learned from starting a new career late in life.

"I was born in 1934. When I was five years old, my mother couldn't stand me banging on the piano, so I got piano lessons. I learned classical piano, and then I wanted to do pantomime. I took drama lessons, then singing lessons. I had all these skills, but in 1958, my husband said to me, "You can't be an entertainer. They're all loose women." That stopped my show career. I got a divorce a couple of years later and said, "The heck with this.""

"I went to Paris in the 1960s, and I had a ball. It was so different from where I lived in Boston. I was sitting in a nightclub playing piano and singing, and I thought, 'This is fun.' I took more lessons, and then I started working in Boston as a pianist and vocalist working private parties. Business Insider just completed its "80-over-80" series."

D'yan Forest was born in 1934 and began piano lessons at age five, later adding drama, pantomime and singing to her skills. After marriage curtailed her performing, she divorced and revived her career, working in Paris nightclubs in the 1960s and performing across Boston as a pianist and vocalist. She moved to New York in 1966, joined a union and developed a French chanteuse persona, singing in nine languages while taking drama lessons to refine English. She holds the Guinness World Record as the oldest working female comedian and emphasizes staying physically and mentally active to keep her life fulfilling.

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