Growing old and grey is an inevitable part of life—something we all must face eventually (for now, at least; who knows what advances in science and technology may bring in the future).

No matter how much money we have, how rigorously we maintain our diet and exercise routine, how well we sleep, or what our profession is, aging is an undeniable part of our biology. While some of us may age more slowly or differently than others, in the end, we all follow the same path. It’s just the way life works, and there’s little we can do to change that.

Which makes it all the more amusing when we’re still surprised by the effects of aging. Have you ever not seen someone for years, only to be shocked by how much they’ve aged? Or perhaps you catch a glimpse of a movie star you remember from your youth, only to find them with grey hair and no longer the vibrant, youthful presence you recall?

It’s an interesting phenomenon—how celebrities age. Like everyone else, their appearances change over time. However, their journey into old age is meticulously documented for all to see. With every film, red carpet event, or public appearance, they leave a trail that we can follow, almost as though we could trace the passage of time with our fingers.