Now also when. — Literally, yea, even to old age and grey hairs. Psalms 129:1 shows that this may be a national as well as an individual prayer.
Thy strength. — Literally, thine arm, the symbol of power. (Comp. Isaiah 52:10; Isaiah 53:1, &c)
Unto this generation. — Literally, to a generation, explained by the next clause to mean, to the coming generation.