An image collage containing 1 images, Image 1 shows Rod Stewart performing at the Glastonbury Festival

ROCKER Sir Rod Stewart is so fit he’ll live until he’s 100, says wife Penny.

Sir Rod, 80, has his luxury home packed out with things to keep him healthy and active in his old age.

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Sir Rod Stewart has promised his wife Penny “another 20 years”Credit: Alamy

Penny said her husband is going to live to 100Credit: AP

She revealed how the singer keeps fit and active at 80Credit: Getty

The crooner has built a 200m running track at his pad in Essex.

He even tries to see how long he can hold his breath underwater in their swimming pool.

Penny Lancaster, 54, who married the Hot Legs singer in 2007, said her hubby had promised her ’20 more years’.

She said: “Rod is very vigilant with his health.

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“He decided he wanted to try and be the fastest 80-year-old, so he built a 200m sprinting track in our garden so he could practise.

“He’s just like a teenager.

“He’s living it to the full.

“We’re trying to keep up with him but he sets the bar.

“He’s promised me 20 years, so I’m seeing 100.”

She also told the Weekend supplement in The Times today: “Even in his workouts, he dives to the bottom of the pool with a weight and won’t just swim on the surface.

“He’s like ‘Just because I’m 80, I’ll prove to myself, I’ll prove to everyone’.

“He’s always striving, as if he’s at the beginning of his life and not the end.”

Sir Rod has sold more than 120m records worldwide, and is famed for hits including This Old Heart of Mine, Maggie May, and Do Ya Think I’m Sexy?.

Penny Lancaster and Rod StewartCredit: Getty