You find a photo taken a decade ago at the bottom of a drawer. It shows you barefaced, grinning, while hiking with family or friends. Back then, you thought that without makeup, eye crinkles clearly visible, this photo made you look old.
In order to live longer, people try their best to increase their longevity and slow down their aging. When you’re 40, you get old. You cannot stop it, because it’s life. Although you cannot stop your aging, you can slow down your aging. This is why a man or woman is 40, but he or she looks 30. He or she know how to slow down aging, but you don’t know.