He was so incredibly sexy in his younger days, even in more scary or somber movies such as Taxi Driver and The Deer Hunter, but he's turned into an equally hot DILF / GDILF
Zac Efron and Robert De Niro in Dirty Grandpa, 2016. De Niro had said he really enjoyed working with Zac and it was one the most fun shoots he had done, also saying he wouldn't have minded if the humor had been raunchier, considering he often amped up the humour in alternate takes in order to embarrass his younger co-star.