Robert Downey Jr. has been something of a "mentor" to his MCU co-stars and they go to him for advice.

The 58-year-old actor, who has battled addiction and been in both rehab and jail in the past, has served as a "mentor" to his fellow stars in the Marvel Cinematic Universe (MCU) and has always been happy to offer them guidance and support, including at the `Captain America` star`s nuptials to Alba Baptista in September.