You met Jack last winter when he was shoveling snow. Jack had his 80th birthday a few days ago. He does yard work nearly every day. Now is the season for Jack to mow the lawn and pull weeds. (At the same time.)
After I wrote this post, I went back outside. Jack was back in his work clothes, balancing a huge ladder against a tree and trimming the lower branches.
After dinner, Jack decided he needed more exercise, so he climbed on his bicycle and went out for a five mile ride.