Though there is no to escape the realities of getting older, some celebrities simply do not age — and the proof lies in these before-and-after photos of some of Hollywood's biggest stars.

From Jennifer Garner to Will Smith and Gwen Stefani, there are tons of celebs who most certainly discovered the secret to defy aging because they have not aged one bit. In fact, Jennifer Aniston barely looks like she's aged a day since her Friends days while other stars, like Jennifer Lopez and Gabrielle Union, literally look exactly the same.

Meanwhile, Reese Witherspoon still looks as fresh-faced as she did in the 2000s, Pharrell Williams still has his boyish good looks and Paul Rudd still looks like he did when he starred in 1995's Clueless.

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Below, check out 30 stars whose looks have barely changed in the past two decades.