The key to anti-aging is why you should apply sunscreen indoors, too.

Even on days I don't go outside, I always apply sunscreen indoors to block UV rays coming through the window. This is because UVA rays can penetrate deep into the skin through glass, causing a loss of elasticity. When inorganic sunscreens leave a white cast, I find a moisturizing organic sunscreen more convenient and easy to apply, like lotion. I believe that even the smallest of habits can determine how my skin will look in five or ten years, so I practice this every day.