As the sports saying goes, Father Time is undefeated. Everybody ages eventually, even Hollywood's rich and famous and attention-seeking reality TV stars.

Not all celebrities are created equal, however. 35 in Hollywood is not the same as 35 in McIntyre, Ga., as the side-by-side photo comparison below illustrates.

Posted in: June Shannon

Before a certain CBS sitcom turned them all into household names and Emmy darlings, this ensemble was hard at work trying to make it in Hollywood.

While some had already achieved success in the industry by the time The Big Bang Theory premiered, others were still waiting for their big break.

Posted in: The Big Bang Theory

It's no secret that actors are often booked to play characters of much younger ages. Kerr Smith was 26 when he played 16 year old Jack McPhee on Dawson's Creek.

His incredibly youthful appearance (which has since become a full head of gray hair by 40) worked in his favor. Other celebrities have ridden a similar wave of good fortune. 

Posted in: Jennifer Aniston

If one thing's for sure after looking through this slideshow it's that Joan Rivers' plastic surgeon needs to start handing out his business card on the red carpet. 

Or we could just let people age like they're supposed to so they don't end up looking like Joan Rivers one day. Yeah, there's that option.

Posted in: Joan Rivers