Robert De Niro plays Ben Whittaker, a 70 year old retiree who gets bored of retirement and takes a place in a senior citizen intern program at "About the Fit," a fast-growing internet clothing company. He's assigned to their CEO and founder, Jules Ostin (Anne Hathaway). She has no time for him, but inevitably they spend time together and grow on each other. Ben is practical and intelligent, and Jules is over-worked and stressed.
The movie is a comedy, and to that end pretty much all of the characters around the two leads are drawn in broad strokes - they're not particularly believable. But when De Niro or Hathaway are on screen - particularly together - the movie works. It's a gentle and charming comedy, a pleasure to watch when you want a break from depressing.