Jennifer Aniston has revealed the thing she fears most about ageing after celebrating her 50th birthday.

The Friends star says she feels "physically incredible" after marking the milestone, but there's one aspect of getting older that she's really worried about.

The beauty looks as stunning as ever, but admits that she's dreading the day her honey blonde hair starts to turn grey.

She told InStyle magazine: "I'm not gonna lie - I don't want grey hair.

"Fifty was the first time I thought, 'Well, that number'. I don't know what it is because I don't feel any different. Things aren't shutting down in any way."

Jennifer also confessed she doesn't like the way people tell women they look good "for their age".

She said: "I feel physically incredible. So it's weird that it's all of a sudden getting telegraphed in a way that's like, 'You look amazing for your age'. I think we need to establish some etiquette around that dialogue and verbiage."