"You're slowing down"? Who cares?
Keep doing what you're doing as long as you enjoy doing it. My mom kept on knitting even after her 2nd stroke. She was NOT very good at it anymore, but she enjoyed it. When she went to assisted living, I collected a pair of knitting needles of each size and a big basket of yarn from her craft room and moved it with her. Her perception of what she could do and what she wanted to do were not even close to the reality of the situation, but she was a happy woman and we all loved making her happy. If you want to slow down, fine. If you want to downsize a bit, fine. Giving up? Stopping? No, totally unnecessary! You go, girl!