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Hot At Any Age! Shirtless Zac Efron, 27, & Robert De Niro, 71, Flex Their Muscles On The Set Of 'Dirty Grandpa' -- 10 Ab-tastic Photos

Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set

Apr. 30 2015, Published 7:30 p.m. ET

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Zac Efron, this is your future — if you're lucky! The 27-year-old compared notes and muscles with acting legend Robert De Niro, 71, on the set of Dirty Grandpa in Georgia today, and RadarOnline.com has the jaw-dropping photos.

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

While filming a new scene for his upcoming feature film, Efron took off his shirt for a flex sesh with De Niro.

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

De Niro is nearly 50 years older than Efron, but he gave him a run for his money!

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

In this photo, Efron stays in perfect form as the elderly actor lifts him over his back, showing him who is really the muscle man!

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

As RadarOnline.com reported, Efron is making a huge comeback this year and he has several movies in production.

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet
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Robert De Niro

De Niro seemed almost upset at how ridiculously hot his younger co-star is. It is just not fair!

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//zac efron shirtless muscles robert deniro bad grandpa
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Efron showed off his gymnastic abilities as he got some help with a handstand off of De Niro's left arm.

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

Dirty Grandpa tells the story of an uptight guy who is tricked into driving his grandfather, a perverted former Army general, to Florida for spring break.

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

Efron and his De Niro are naturals!

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Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

"You talkin' to me?"

Zac Efron Shirtless Muscles Robert DeNiro Bad Grandpa Set
Source: FameFlynet

De Niro had the brawn to do it, but he used a stunt double to throw Efron over the shoulders.

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