Sir Rod Stewart, bragging about his physical fitness. And why not? At the age of 80, he's still touring the world, giving concerts, recording new music and even writing a book about his favorite model train, the BBC reports.

This weekend, he'll be playing the Pyramid stage in Glastonbury in the prestigious "legends" category... although the former headliner isn't 100% happy with his performance.

"I just wish they wouldn't call it 'tea time'," he laments.

Stewart has also persuaded the organisers to extend his set, securing an hour and a half slot after initially being offered 75 minutes.

"I usually play over two hours, so there are still a lot of songs we won't be able to do," he says.

"But we've been working on it. I'm not going to make any statements between songs. I will sing as many songs as I can," the star added.

It's not as if he lacks choice. Sir Rod has some of the most classic songwriting of all time, from early hits with the Faces like Stay With Me and Ooh La La, to his solo breakthrough with Maggie May, the smooth pop of Do Ya Think I'm Sexy? and his reinvention as a singer on songs like Downtown Train and Have I Told You Lately.

The last time he played Glastonbury in 2002, he was perceived as an interloper, sitting awkwardly on stage alongside The White Stripes, Coldplay and Orbital.

Initially "the audience was wary" of the musician, who "seemed to take himself too seriously", says the BBC's Ian Youngs in a review of the show.

But the unprecedented setlist of songs won over the attendees. By the end of the night, 100,000 people were swaying in time to "Sailing," as if they really were floating on the waves of the Atlantic.

Amazingly, Rod has no memory of this.

"I don't remember anything," he admits. "I do so many gigs that they all blend into one." 

One particular performance, however, stands out. On New Year's Eve in 1994, Sir Rod performed a free concert on Brazil's Copacabana Beach that drew more than three million people.

But it wasn't the record-breaking audience that made the event memorable.

"I fell violently ill about an hour before I was due to go out. I thought I wasn't going to make it, but luckily they called a doctor to cure me," Stewart said. | BGNES