You wouldn't like him when he's grey.
At least, that's the opinion of The Avengers star Mark Ruffalo, who plays the Hulk in the popular franchise.
The 46-year-old says while he's keen to keep playing the quick-tempered Bruce Banner, his age might get in the way.
"I did the math, and in three more movies I'll be in my 50s," he told a Reddit Ask Me Anything session.
"I don't know if anyone wants to see a gray-haired Hulk."