[null and void]

but specifically where is it written exactly how long that life should be?

Psalm 90:10

[NicknamedBob]

but specifically where is it written exactly how long that life should be?

Psalm 90:10

"... and if by reason of strength they be ..." more, it's allowed.

Strength, or artifice, or science, or modern medicine, or whatever the great gift of a thinking brain can devise; these shall be the instruments of man's efforts to extend the childhood of learning that is his life on Earth.