This is not really an answer, but I would like to draw the attention to the distinction between speech in fictional work and speech in the real world.
In fictional work, there is a set of words (most notably personal pronouns and function words) which are considered to be typical to a certain group of people, _regardless of whether the people in the same group in the real world actually use them_. It is called a _role language_ (). As dainichi explained, first-person pronoun and copula are part of the role language for old male speakers. So are second-person pronoun []{} and the use of instead of . However, I am pretty sure that few old male people actually say any of these.
My guess is that old male speakers do not have particularly different words from other adult male speakers, but I am not very sure about this part.