American Standard Version (ASV):
Yea, even when I am old and grayheaded, O God, forsake me not, Until I have declared thy strength unto [the next] generation, Thy might to every one that is to come.
King James Version (KJV):
Now also when I am old and grayheaded, O God, forsake me not; until I have shewed thy strength unto [this] generation, [and] thy power to every one [that] is to come.