Former Top Gear and current Grand Tour presenter Richard Hammond says he is having a "real crisis" about turning 50.

He celebrates the milestone birthday later this year and admitted on Good Morning Britain: "I'm absolutely in a . . . panic. I'm having a real crisis about it. I can't be 50 because I'm like 11."

He told the ITV breakfast show: "Fifty is older than most of the teachers. Fifty is properly grown up."

Hammond, Jeremy Clarkson and James May have reunited for a third season of the show they started following their departure from the hugely successful Top Gear.

Hammond said of Amazon Prime, which screens the show when it returns later this month: "They can tell you exactly who's watching and who likes what bit.

"They won't tell you how many. But they will tell you which bit. And everyone loves the big adventure, so we have dialled that up."