United Kingdom, Aug. 14 -- John Cena doesn't want to "take time away" from WWE's next big superstars.

The 48-year-old wrestling legend turned Hollywood actor is set to retire from his in-ring career when his current farewell retirement tour comes to an end in December, and he's opened up about why the timing is just right.

Appearing on The Tonight Show with Jimmy Fallon, he said: "I remember when I was a young kid back in 2002 thinking I'd never get a chance, and then when I did I came up with a young, hungry class.

"I think if I hang around any longer than now, I'm just taking a time away from those young guys who can [get] the next chance to make an impact.

"It's time, man, it's time."

Cena - who will face Logan Paul on August 31 a...