Cilla Black said she wants to "bow out" of life in eight years' time when she gets to the age of 75.
The 67-year-old star said she was at "a really good point" in her life but she did not want to go on forever.
She told this week's Yours Magazine: "I was reading about an age pill that's been developed which they claim will make you live longer. That's not for me. I don't want to live beyond the age of 75. That would be a good point to bow out."
The singer and television presenter said she was influenced by the experience of her mother who survived for several years despite having to be fed through a tube.
She said: "Unfortunately - and I do mean that - her heart was strong. The result was that she lived much longer than she wanted to.
"I remember asking her doctor if she could do something to relieve my mother's suffering. I'm not talking about euthanasia. I just wanted the pain to stop for her. But the short answer was no."