Songfacts®:

• The title track of Mac DeMarco's third album, this song finds him singing:
  
  Oh dear, act your age and try another year
  Always feeling tired, smiling when required
  Write another year off and kindly resign
  
  DeMarco told Mojo magazine that he penned the lyrics exhausted after two years of non-stop touring, when he called "the crowd, peasants and s--t."
  
  He added: "It's easy to become an a--hole on tour, especially with people treating you nice. So those lyrics were me checking up on myself. The verse is like: 'I'm so jaded,' and the chorus is like: 'Act your age.'"
• "Salad days" is an idiomatic expression referring to youthful inexperience, when people are very green. The phrase was coined in Shakespeare's Antony and Cleopatra in the Egyptian pharaoh's speech at the end of Act One in which she is regretting her youthful dalliances with Julius Caesar. She says:
  
  My salad days
  When I was green in judgement, cold in blood
  To say as I said then