The Doctor Who star was discussing his interest in comic book films with Collider, when he teased that he is about the right age to portray Mr Fantastic on the big screen.
"I'm a bit old for a lot of [the comic book roles] now, which is a terrible, alarming truth," Tennant joked to the website.
He continued: "Who could I be? I could probably still do Reed Richards - Mr Fantastic. I don't know."
Reed Richards has previously been played by Ioan Gruffudd on the big screen in Marvel's first two Fantastic Four movies.
The Fantastic Four film series is currently being rebooted by 20th Century Fox and director Josh Trank of Chronicle fame.
Pride and Prejudice and Zombies writer Seth Grahame-Smith is working on a script for the project, and X-Men: First Class helmer Matthew Vaughn is attached to produce the movie.
Marvel's Fantastic Four will reportedly begin production in September , with casting announcements to be made soon.
The movie will hit cinemas on March 6, 2015.