Nothing ever stays the same.
We live in a world that is groaning and travailing as time moves toward its end. Everything that is born is moving toward physical death from the moment of birth. For His Own, there is a sense of momentum that precludes burying treasure on the earth.
As the Soldier of The Cross moves through life, the theme of prayer, song and thought must be "change me." We are to be like Him and that is a process. It is nothing we do ourselves, although there is no sweetness apart from walking in the Light.
As you get older, you are finding the body wants to move less. The mind resists new exercises. The soul craves familiar assurances.
Those who agree with God become more flexible and available for adventures in faith, even in the twilight years.
Be available to Him for anything. Tell Him so.
Aloud.