Ah, “beauty experts.” We think of them as the people who continually tell us to change in order to improve the way we look, yet all too often, their advice changes as frequently as the seasons do. But while some wisdom may come and go, these smart beauty maxims have stood the test of time.

“I don’t understand how a woman can leave the house without fixing herself up a little, if only out of politeness. And then, you never know, maybe that’s the day she has a date with destiny. And it’s best to be as pretty as possible for destiny.” —Coco Chanel, fashion designer

“Where lipstick is concerned, the important thing is not color, but to accept God’s final word on where your lips end.” —Jerry Seinfeld, comedian

“There are no ugly women, only lazy ones.” —Helena Rubinstein, cosmetics company founder

“Zest is the secret of all beauty. There is no beauty that is attractive without zest.” —Christian Dior, fashion designer

“I don’t like standard beauty—there is no beauty without strangeness.” —Karl Lagerfeld, fashion designer

“You can take no credit for beauty at sixteen. But if you are beautiful at sixty, it will be your soul’s own doing. —Marie Stopes, women’s rights and birth control advocate

“I think the beginning of all beauty is knowing and liking oneself. You can’t put on makeup, or dress yourself, or do your hair with any sort of fun or joy if you’re doing it from a position of correction.” —Kevyn Aucoin, world-renowned makeup artist

“Nothing is as beautiful as someone who loves being alive just as they are.” —Frédéric Fekkai, world-renowned hairstylist

“Beauty is only skin deep, but ugly goes clean to the bone.” —Dorothy Parker, writer and humorist

“The most beautiful makeup of a woman is passion. But cosmetics are easier to buy.” —Yves Saint Laurent, fashion designer

“The problem with beauty is that it’s like being born rich and getting poorer.” —Joan Collins, actress and author

Whether you’re eighteen or eighty, it’s best to pay attention to advice that never goes out of style. And, of course, always remember to wear sunscreen.