I heard this story today.
A missionary had to retire from working in Afghanistan as the area was too dangerous.. She was sad because her heart was with the Afghan people. As she was in her mid 80’s she felt she would be too old to serve the Lord again. She retired to Birmingham where she had originated from.
Here a surprise awaited her. Refugees from many nationalities were crowding into the city. Before long she was found by a group of Afghans and her knowledge of their language and customs meant she could translate for them and help them acclimatze to England.
Far from being of no use to the Lord she was more in demand than ever, doing a job she was completely suited to. We never retire when working for God.