We've got one set of grandparents (mid seventies to mid eighties in age) coming to stay for Christmas.
So they will need stockings like the rest of us.
So far I've got:
Grandma:
Hand cream
Notebook
Book
Favourite chocolate
Grandad
Book
Favourite chocolate
They live in a different country and are going home the day after Boxing Day so ideally small/perishable items that won't add to much to their luggage!