Robert Downey Jr. says Marvel fans are ''really good'' for his ego.

The 'Avengers: Age of Ultron' star, who plays Iron Man in the franchise, created a frenzy at the movie's European premiere at the Vue Cinemas in the Westfield, London last night (21.04.15), but thinks it's time he ''passed the torch'' on to his younger co-stars.

Asked about the adulation, the 50-year-old star joked to BANG Showbiz: ''It's really good for my ego because I'm so introverted.

''But look, all that matters is that I think we made a better movie this time. I didn't know that we could do that, but the fans won't be disappointed.

''It's about time I passed the torch [to other Avengers] - it's been getting hot in my hands.''

The blockbuster is a follow-up to 2012's hit 'Avengers Assemble' - both of which were directed by Joss Whedon - and Robert admits they ''put a lot of pressure'' on themselves to improve on the first film.

He said: ''We put a lot of pressure on ourselves to try to make a movie that was as good or better than the first one, and I think it's better than the first one.''

Other stars at the premiere included Scarlett Johansson, Chris Hemsworth, Jeremy Renner, Elizabeth Olsen, Mark Ruffalo, Paul Bettany and Chris Evans.