The Apostle Paul said, "even though our outward man is perishing, yet the inward man is being renewed day by day." This is written to those who follow Christ, and is a truth easily missed until you begin to 'feel your age.' For me these days are some of the most exciting of my christian life. Spiritually I think I'm in pretty good 'nick.' I enjoy my christian life as much as ever. I love the Church that I'm a part of and the people who attend. I'm sure you sense a 'but' and indeed there is one. The body is not what is once was, running up the escalator is a distant memory, the touch of arthritis in the knee, occasionally forgetting people's names and I could go on.
Here, friends is the great truth that the Apostle spoke of: Although our body does deteriorate, our inner man is day by day being energised by the Holy Spirit, and in Him we will never age. Bit dodgy on the outside, but brand new on the inside.