We see celebrities flawless on screen and mostly off-screen as well. But in real life, they are not flawless and they are humans just like other. They also get fat, age, sick and bald like other peoples with ageing.
It is really so shocking to watch those celebrities age. You can check and the cast of a decade old movie or TV series now. It will be actually shocking to see them today with wrinkles and grey hair. You think of these people as their characters stuck in the past, when really, they are just like us.