Niall Horan fears bad knees will hobble his career

One Direction star Niall Horan is worried he will be forced to quit performing while still a young man because of his troublesome knees.

The Best Song Ever hitmaker was asked whether he could emulate 70-year-old Rolling Stones frontman Sir Mick Jagger by performing in front of huge crowds in his twilight years, but Horan insists he will not be healthy enough.

He says, "Jagger does it but I don't think at the moment I'd be able to. I've got dodgy knees."