<human>: Summarize the given text in a few sentences.

Reddit,  

My grandpa is 85 years old and has recently suffered a series of small strokes.  They have not incapacitated him but have left him off balance and a little shaky, making it difficult to do anything that requires walking or standing. 
 
He has been extremely independent throughout his life and has always found fulfillment through physical activity (at 83 years old he put a new roof on his home).  He is still extremely capable mentally (He can still recount vivid details of his WWII days and run circles around me with basic math or remembering a grocery list) and has become extremely depressed and finds it hard to look toward the future.  

Being so much younger, I feel I have little to offer in the way of advice.  I was wondering if any redditors out there have had a similar experience with a grandparent or parent, and how they helped them to overcome it.  Any hobbies in particular that work well or advice you can offer would be greatly appreciated (even if only an upvote so this gains a wider audience, I'm just asking for gathering karma).  It it is excruciating to see a person suffer like this, especially when you care about them this much
Side note: my grandmother still manages to spend her time gardening, cooking, cleaning, and talking with friends and my mother when she visits.
<bot>: My grandfather is 85, self-sufficient but home-bound.   What can he do that occupies time and gives his life meaning?