Hi,
John McCain is not too old to be President as long as he is not showing any signs and symptoms of dementia and Alzheimers disease. He seems very lucid and still makes a lot of sense.
Because of his age, he has got a lot of experience more than Hillary and Obama combined. That's why I think that he will be a very good President for at least one term. Then either Condoleeza or Mitt Romney will follow.
Obama is too young to be President. He is just like a young kid trying to run the show.