NET
4 “O Lord, help me understand my mortality and the brevity of life. Let me realize how quickly my life will pass.
Darby
4 Make me to know, Jehovah, mine end, and the measure of my days, what it is: I shall know how frail I am.
KJV
4 LORD, make me to know mine end, and the measure of my days, what it [is; that] I may know how frail I [am].