The days
yowm (yome)
a day (as the warm hours),
of his youth
`aluwm (aw-loom')
(only in plural as abstract) adolescence; figuratively, vigor -- youth.
hast thou shortened
qatsar (kaw-tsar')
to dock off, i.e. curtail (transitive or intransitive, literal or figurative); especially to harvest (grass or grain)
thou hast covered
`atah (aw-taw')
to wrap, i.e. cover, veil, cloth, or roll -- array self, be clad, (put a) cover (-ing, self), fill, put on, surely, turn aside.
him with shame
buwshah (boo-shaw')
shame -- shame.
Selah
celah (seh'-law)
suspension (of music), i.e. pause -- Selah.