Ben Affleck filming argo 70's hollywood

Ben Affleck is diving head first into his 70's character in Argo ... literally. Check out that hair!

Jennifer Garner's hubby looks shagtastic while on set of the flick which also stars John Goodman, Bryan Cranston and Alan Arkin.

The film, based on a true event from 1979, revolves around six US hostages that escape their Iranian hostage takers.

Intense ... just like Ben's new look.