Everyone goes through visibly noticeable changes as the years go by. Celebrities are no different, and many turn to cosmetic surgery to slow down the ticking hands of time. Understandably, being public figures whose looks have a hand in earning them an income, most stars do what it takes to maintain their youthful glow.

Until scientists cook up a fountain of youth, no one can escape the natural process of aging. Here is a list of celebrities who look quite different now after losing weight, battling substance abuse issues, or simply because age caught up with them.

Courteney Cox – Cougar Town

Courteney Cox won our hearts as one of the main stars of the beloved ’90s sitcom Friends, where she played the part of Monica Geller. She continued entertaining us in other productions like Mothers and Daughters and Cougar Town. Expect to see her in the upcoming productions Scream, Shining Vale, and Last Chance U.

Age has caught up with Cox at 57. To help her maintain her glow, she prefers treatments that are non-invasive. She claims to be a big believer in laser and is interested in therapies to produce collagen. Cox is also mindful to relax body and mind.

Michael J. Fox – Back To The Future