Rolling Stones guitarist Keith Richards has apologised to frontman Mick Jagger after joking that the 74-year-old father-of-eight should undergo a vasectomy.

In an interview with the Wall Street Journal, Richards (74) did not do his bandmate of over 50 years any favours as an older parent. 

"It's time for the snip," he said. "You can't be a father at that age. Those poor kids!"

A contrite Richards later took to Twitter, writing: "I deeply regret the comments I made about Mick in the WSJ (Wall Street Journal) which were completely out of line. I have of course apologised to him in person." 

Jagger became a father for the eighth time in December 2016 when his ballerina girlfriend Melanie Hamrick (30) gave birth to their son, Deveraux Octavian Basil Jagger.

The Rolling Stones are scheduled to begin the second leg of their European tour at Croke Park on Thursday May 17 with tickets to go on sale on Friday March 23.

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