Ken is in the old father club

The Mayor is joining a growing club of men who discover the joys of parenthood later in life.

Actor David Jason became a father last year at 61. He has embraced fatherhood with enthusiasm, despite complaining of the sleepless nights. "She wakes up in the middle of the night and you want to ask them to go back from whence they came," he said.

Today presenter John Humphrys became a father at 56 to a son, Owen.

He said: "I want to watch him all the time." Tony Blair was 47 when son Leo was born two years ago.

Hollywood actor Michael Douglas had a son, Dylan, with Catherine Zeta-Jones at 56.