Many people enjoy working hard, often on some favorite project, as they age. This is admirable and so much better than remaining idle most of the time. My only concern is that if all your work is self-centered, you may lose the time you need to secure the salvation of your soul. When we realize that our time on earth is limited, it's time to work more for the Lord and less for ourselves. As we get closer to meeting the Lord, we need to improve our relationship with him as much as possible. The wise would start to seek union with the Lord from the very outset.