The days of our years are, &c.— If this may be thought too short a term for the general standard of human life in those early ages, as one would infer from hence that Moses could not be the author of this psalm, yet it suits well with the particular case of the Israelites in the wilderness, whose lives were shortened by an express decree, so that a great number of them could not possibly reach the age of seventy; and those who did, probably, soon felt a swift decay.
Related Commentaries of Psalms 90:10
Psalms 90:10
10 The daysa of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow; for it is soon cut off, and we fly away.