Glee star Idina Menzel has ruled herself out of a big screen adaptation of hit musical Wicked, insisting she's "too old" for the part.

The Broadway icon originated the role of Elphaba, the Wicked Witch of the West, alongside Kristin Chenoweth as Glinda in 2003, and was a huge success.

There have been plans for a movie version of the tale, about the beginnings of the Wizard of Oz characters, for several years, but 42-year-old Menzel insists she and Chenoweth are now too old to reprise their iconic roles.

Speaking to Andy Cohen on U.S. chat show Watch What Happens Live, she was asked if she had been approached to star in the film, to which she quipped: "Yeah, as the mother of Elphaba."

She added: "I would die to be in (the film), except I'm afraid Kristin and I... they told us we're a little over the age for that."