Marvel star Robert Downey Jr, famously known as `Iron-Man` turns 58 on April 4. From On this occasion, let us have a look at the lesser known facts about the actor.

1) It is no surprise that Robert Downey Jr is an actor as he comes from a line of actors. His father, Robert Downey Sr is a well known actor and film-maker while his mother, Elsie Ann Ford was also an actor.