Jimmy Fallon sings 'Old Man' as Neil Young -- with the real Neil Young

Jimmy Fallon brought back his Neil Young impression to The Tonight Show Tuesday evening—and was joined by Young himself halfway through his time on stage.

Fallon typically chooses more recent hits, like Iggy Azalea's "Fancy" or Willow Smith's "Whip My Hair," for his Neil Young impressions, but this time he went for a Young original: 1972's "Old Man," a song that gave him a chance to showcase just how spot-on his impersonation of the Rock and Roll Hall of Fame two-time inductee is.

Young isn't the only musician Fallon impersonates, though: He's also played Bruce Springstreen (by Springstreen's side) and The Doors' Jim Morrison in the past.