Robert Downey Jr. started acting at age 5 , with his screen debut in his father’s film Pound in 1970.

Quick Scoop

  • Started acting: age 5.
  • First film: Pound.
  • Why it matters: it was his first screen role, so his acting career began in early childhood.

TL;DR: Robert Downey Jr. began acting when he was 5 years old.