Sure but he's apparently out of the business and doesn't have access to top of the line tech and support anymore. I'm sure that if he called Pepper Potts ( i suppose she's still leading Stark Technologies) she would immediately put him on a plane to the best facilities in the world to repair his hearing and maybe fix some bones/joints.
But i guess he doesn't want anything to do with that side of his life, he's done his duty for king and country, paid heavily for it ( both emotionally and physically) and just wants to live a quiet life with his family. Enter Kate Bishop..