Many celebrities look decades younger than their actual ages.
Although many of them undergo treatments and procedures that the majority of people can't afford to make them look flawless, a number of their natural anti-aging tips — like wearing sunscreen and eating balanced meals— can actually work.
INSIDER consulted scientific studies to find which of their beauty secrets are based in fact.
Here are 9 scientifically proven ways that celebrities stay looking young.
They drink plenty of water.
Celebrities like Jennifer Aniston and America Ferrara claim that drinking water has worked wonders for them.
Aniston, 48, told Yahoo! Beauty that "drinking a lot of water" is one of her anti-aging secrets. And Ferrera, 33, told InStyle: "Once I started drinking more water, my skin, hair and nails all flourished."
A 2015 study, published in the Clinical, Cosmetic and Investigational Dermatology journal, helps to confirm the belief that drinking plenty of water benefits the skin.
Researchers collected a sample of 49 healthy females who were then split into two groups. For a month, one group drank at least 5.2 liters of water a day while the other group drank less than 3.2 liters.
The researchers found that consuming more water daily is a great way to boost skin's hydration levels. Moreover, hydrated skin can lead to a youthful glow over time.
They make time for sleep.
Back in 2011, Christina Aguilera, 36, told People magazine that she takes pride in sleeping for a minimum of eight hours, which is consistent with the Centers for Disease Control and Prevention's recommendation.
"People spend money on beauty potions, but a good night's rest makes all the difference," the singer said.
In 2016, scientists explored the relationship between insufficient sleep and dermatoligic conditions. Apparently, not sleeping enough can wreak havoc on your skin, causing you to look older and recover slower from skin damage or irritation.
But they never fall asleep with their makeup still on.
Mary J. Blige, 46, told InStyle that she never goes a full day or night without washing her face.
"You have to get all the dirt and makeup out of your pores," she said.
In fact, the American Academy of Dermatology (AAD) lists washing your face gently as one of the best ways to prevent premature skin aging. According to the organization, "scrubbing your skin clean can irritate your skin. Irritating your skin accelerates skin aging."
In July 2010, Dwayne "The Rock" Johnson, 45, tweeted his skin care routine — which includes Neutrogena's Deep Clean Cleanser ($7) — that keeps him looking youthful.
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