J. Oswald Sanders tells the following story illustrating how age has nothing to do with service:

“Benjamin Ririe retired as a missionary with the China Inland Mission at the age of seventy. When he was eighty and found time hanging on his hands, he decided to learn New Testament Greek, because he had lacked the opportunity when he was younger. Ririe became proficient in reading the Greek New Testament. At ninety, he attended a refresher course in Greek at a Toronto seminary. When he was one hundred, he was present at a meeting at which I was speaking. In his pocket was a small, well-worn Greek Lexicon he used to brush up his language skill as he traveled on the subway to and from the meeting.”

“Oh God, keep me from becoming a foolish old man.
Help me end well.” – H.A. Ironside