'Fails' in the Bible

For my life nears its end in pain; my years draw to a close as I groan. My strength fails me because of my sin, and my bones become brittle.

For innumerable dangers surround me. My sins overtake me so I am unable to see; they outnumber the hairs of my head so my strength fails me.

Do not reject me in my old age! When my strength fails, do not abandon me!