In the book of Joshua, chapter 13 we read that G-d is telling Joshua,
“You are old, advanced in years, and there remains very much land yet to be possessed.”
G-d basically told him, “I am not done with you yet, there is still much to accomplish.”
As we get older we tend to foolishly think that G-d can’t use us for certain things because it is too late for us, that our time for use has passed us by. This is an absurdity. G-d has ALWAYS used ANYONE who is WILLING to be USED OF HIM.
Seek G-d and His Will in your life and NEVER STOP. He has an assignment for you and when that one is done, He has another.
As David wrote in Psalm 1, verse 2 (second half)
“…and in His Law he meditates [plans] day and night”
we need to plan according to G-d’s perfect Law, His perfect Will. The only way to do this is to spend time in prayer and in His Word. Talk with Him, walk with Him, grow in your relationship with Him.
Delight yourself in His Law and He will bless you, beyond your expectations and beyond your abilities regardless of your age or physical condition.
To G-d be the Glory forever!