Collier's folio reads Fall. I agree with it.
"As we rate boys; who being mature in knowledge."
I read 'immature,' for the negative is required.
"And the ebb'd man, ne'er lov'd till ne'er worth love,
Comes fear'd by being lack'd."
Warburton, who has been generally followed, made the correction dear'd. But there is no such verb. I read dear. "I shall be lov'd when I am lack'd" (Cor. iv. 1). Come for became occurs also in "so came I a widow" (2 Hen. IV. ii. 3).
"Goes to and back lacking the varying tide."