Former Friends star Courteney Cox says she is reconciled to looking older and regrets some procedures she had done to keep the wrinkles at bay.

Cox, 52, spoke out during an expedition with outdoor adventurer Bear Grylls on the Irish highlands, in which the pair abseiled down sheer cliffs and shared maggots found in a rotting sheep.

"Getting older has not been... I don't think it's the easiest thing. But I have learnt lessons," she said in the Running Wild With Bear Grylls episode that aired on NBC on Monday.

Cox, who spoke some years ago about using Botox and laser treatments to prolong her youthful looks, said she is now more relaxed.

"Sometimes you find yourself trying and then you look at a picture of yourself and go, 'Oh, God.' Like, you look horrible. I have done things that I regret and, luckily, they're things that dissolve and go away. So, um, that's good, because it's not always been my best look. So now I just have a new motto: 'Just let it be,'" she said.

She is the latest star to speak out about the pressure women feel in Hollywood to maintain their looks.

Her Friends co-star Jennifer Aniston, 47, last month wrote that she is sick of the "sport-like scrutiny and body shaming that occurs daily" in celebrity and other media, while Renee Zellweger, 47, slammed persistent speculation that she had undergone plastic surgery on her face or eyes.

"Too skinny, too fat, showing age, better as a brunette, cellulite thighs, face-lift scandal, going bald, fat belly or bump? Ugly shoes, ugly feet, ugly smile, ugly hands, ugly dress, ugly laugh; headline material which emphasises the implied variables meant to determine a person's worth," the actress wrote in an Aug 5 blog for the Huffington Post.

REUTERS