The word ‘retirement’ is not contained in the Bible, nor is the concept of quitting.
Because you have kept My command to persevere, I also will keep you from the hour of trial which shall come upon the whole world, to test those who dwell on the earth. ~ Revelation 3:10
Each of the letters to the seven churches in Revelation includes a caution to persevere, to be faithful unto death, to hold fast, to overcome, or to strengthen what remains.
Christians don’t simply plan for the future, we press onward.