Another one? at 60+? Very bad idea.
Recognizing he was an aging action star what he should have done was filmed T2-3 or T2-4 concurrently (when he still looked decent) and the studios could have released them every 3-5 years. They do this all the time. Much of Superman I and II were filmed concurrently. Matrix Reloaded and Matrix Revolutions were filmed concurrently as well. Studios like to do this because they can save a ton of money on production costs (set decoration/designs, location, make up, costume design, casting, etc).
No amount of hair dye, face lifts, or steroids, can make him look good enough to be the Terminator again.
Bah!