Jennifer Aniston would tell her younger self to enjoy her "youth".
The 'Cake' star - who spent her early 20s in New York struggling to make it on as an actress on Broadway - admits if she could go back in time and give her 20-year-old self some beauty advice it would be to enjoy her looks and body while you're young.
She said: "First advice, of course, would be to wear sunscreen! That's a big one. And don't sweat it. It's all gonna be good. It all seems so serious and daunting, there's the pressure that everything has to be perfect, and you wanna grow up. Just relax and enjoy your youth."
Jennifer would also stress the need to be happy in your own skin and be confident in who you are as a person.
She added: "Developing your inner beauty is so important. Truthfully, beauty is in the eye of the beholder and there are so many versions of what that is. It's really about loving yourself."
That being said, the health conscious actress - who married her "best friend" Justin Theroux at the age of 46 in August - has always been an advocate of healthy living.
She told InStyle: "Being good to yourself, and being healthy. It's important to think about what you put inside your body, but also what you put inside your ears and what you put inside your mouth. All of that is very precious."