There used to be an expression that anyone over 65 was on borrowed time. Well I suppose today it is probably 75. Our Lord gives us the time to do our work for Him. All of us at that magic number of 75 must just continue on. It is not for us to worry but do the best we can.
As Pope Paul the XI stated in "Lumen Gentium":
By reason of their special vocation it belongs to the laity to seek the Kingdom of God by engaging in temporal affairs and directing them according to God's will.
We just continue "to seek the Kingdom of God" and "not be affraid" and we will come out fine.
**We just continue "to seek the Kingdom of God" and "not be affraid"**
And I would add "pray constantly" to those two excellent suggestions.