I have several men/women that are aggressive verbally and physically. I have found that besides the normal diversional activities (folding clothes, pipe construction)...legos are a wonderful tool, it gives them something to construct, they are colorful, and if they are set in a quite setting it works wonders. Also, i'm a firm believer in food, rootbeer floats are a great diversional tactic. Some do well helping sort papers, folding letters, stuffing envelopes, many times it's the "helping someone else out" that changes the aggression.
But, getting to know the "old" person...their habits, likes/dislikes...often times a person's mentality changes if they have dementia/alzheimers/etc. Good luck. Hope this helps!