At the age of 61 in 2001, Sir David, who is now 83, believed he had become a father for the first time.
At that time, Lady Gill Hinchcliffe, his then-girlfriend and current wife, gave birth to their daughter, Sophie Mae.
Unbeknownst to him, he was also the father of Abi, who was born in 1970 as a result of a brief romance between Sir David and Jennifer Hill, an actress who had starred in the James Bond movie Octopussy.
The two met when Abi began to wonder if the TV personality might actually be her biological father and wrote to him to clarify.
David Jason age: How old was David Jason when he married?
David was 61 years when he married.
How old was David Jason when his last child was born?
Jason, then 61, became a father on February 26, 2001, when Gill Hinchcliffe, then 41, gave birth to a baby girl named Sophie Mae at Stoke Mandeville Hospital in Aylesbury.