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The Rolling Stones are gearing up for their comeback show tonight at London's O2 arena - but Mick Jagger is finding it harder than usual.
The 69-year-old is starting to feel his age, as all that strutting around the stage could be taking a toll on him.
A source told the Sunday People, "Rehearsals have been electrifying. Mick is giving everything. He's as good as he was in his 20s except now it hits him a lot harder.
"It's taking its toll. But Mick is working out to stay fit."
Good to know. The Rolling Stones just wouldn't be the same without those legendary moves like Jagger...
The Stones are performing their first comeback concert in London tonight, with a second concert also at the O2 arena to take place on Thursday (29 November). They have announced that Mary J Blige and Jeff Beck will be special guests at the show.
Former band members Bill Wyman and Mick Taylor are also going to join the Rolling Stones on stage, which will make it the first time they've all performed together in more than 20 years.
Above - Bill Wyman will return to the stage with the Rolling Stones.
However, even when the concerts end, it hopefully won't be the last we'll see of the Rolling Stones for a while.
Keith Richards told Rolling Stone, "Once the juggernaut starts rolling, it ain't gonna stop.
"So without sort of saying definitely yes - yeah. We ain't doing all this for four gigs!"
Watch the video for 'Doom & Gloom' below:
Below: the O2 setlist? Backstage photos reveal Rolling Stones tour secrets
