After a heart attack and an epiphany, Harry Sanborn (Jack Nicholson), a swinger and music mogul on the cusp of becoming a senior citizen, and with a taste for younger women, falls in love with Erica Jane Barry (Diane Keaton), an accomplished woman closer to his age.

After a heart attack and an epiphany, Harry Sanborn (Jack Nicholson), a swinger and music mogul on the cusp of becoming a senior citizen,...