Well it's my Dad, not my Grandfather, but, well, he is a grandfather and he is in his '70s. ;) The guy can still drive a 3 inch nail in with 3 hits of his hamm

Well it's my Dad, not my Grandfather, but, well, he is a grandfather and he is in his '70s. ;) The guy can still drive a 3 inch nail in with 3 hits of his hammer but has real trouble with the end of his finger, of which the last 1/4 inch is missing, courtesy of a saw blade. He also has trouble grasping a mouse due to tendon damage in his right hand caused by a nylon rope, a flooded creek and a rescue attempt - well, you get the picture. Old guys who have worked hard have the money to spend, and the interest, but just aren't a use-case for product designers. I've long argued that a phone company who brings out a simple, affordable phone with a long-lasting battery, large buttons, easy to read simple screen and ear-shatteringly loud ringers would clean up the seniors market.