Cristiano Ronaldo discovers his 'biological age' - and jokes he'll play for ANOTHER 10 years

Former Manchester United and Real Madrid star Cristiano Ronaldo is still going strong at the age of 40 and it appears that the Al-Nassr forward is not aiming to hang up his boots any time soon

Cristiano Ronaldo has scored 33 goals for Al-Nassr this season

Cristiano Ronaldo has joked that he could play on until he’s FIFTY after his ‘biological age’ was revealed. The former Manchester United forward is still going strong at 40.

He has netted 33 goals for Saudi side Al-Nassr this season - that form coming after 64 goals across his first 18 months in the Middle East. Naturally, Ronaldo would usually be putting a little bit of thought into hanging his boots up having reached the twilight of his career.

But it appears that new data might have convinced the Portuguese forward to carry on even longer. Ronaldo has had a long-running partnership with fitness watch manufacturers WHOOP.

And part of the technology has revealed that his ‘biological age’ is over a decade younger than he actually is. Speaking on the WHOOP podcast, he said: "I can't believe it's so good. 28.9."

And after learning that, Ronaldo joked that he could potentially prolong his career well into the 2030s. He added: "This means I'll play football for another 10 years."

READ MORE: Cristiano Ronaldo 'receives major offer' to quit Saudi football and play at Club World Cup READ MORE: Lionel Messi lashes out at MLS referees and claims 'they don't know the rules'

Ronaldo has already spoken about potentially stepping away from the pitch. While he confirmed that there wasn’t a specific plan, he did admit that it was something on the horizon.

He said: "I just want to enjoy. Plan for retirement... if it has to happen, in one or two years... I don't know. I'm turning 40 soon... I really want to enjoy, as long as I feel motivated I keep going.

“The day I don't feel motivated, I will retire. When I decide to leave the national team, I'll do it spontaneously but thoughtfully. There won't be any advance announcements.

“I don't see myself managing a team; that's not in my plans. My future lies in other areas outside of football, although time will tell what happens."

Ronaldo shows no signs of slowing down at the age of 40

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Meanwhile, Jimmy Floyd Hasselbaink has also given his verdict on Ronaldo’s future. And the ex-Chelsea man suggested he could call it a day when long-term rival Lionel Messi does.

He said: "We all know as footballers, and I know this really, really well from my playing time, there's a time when you come and there's a time where you need to go. I think his time had come a while ago, and he needs to give somebody else the opportunity.

"I don't think that he is at the moment better than the other options that Portugal have. Some games you need to press, some games you need to do different things, and I don't think that he can do that anymore. There’s no shame in that. For him to even be playing at 40 is a landmark in itself.

"There comes a time when you have to hang the boots up. I think that time will come when Messi stops. I think when Messi decides to call it a day, so will Ronaldo."