Adams on Psalm 90:10

10 Their strength is labour and sorrow Most commonly old age is a feeble estate; the very grasshopper is a burden to it. Ecc 12:5. Even the old man himself is a burden, to his wife, to his children, to himself. As Barzillai said to David, "I am this day fourscore years old: and can I discern between good and evil? Can thy servant taste what I eat or what I drink? Can I hear any more the voice of singing men and singing women?" 2 Sam 19:35. Old age, we say, is a good guest, and should be made welcome, but that he brings such a troop with him; blindness, aches, coughs, etc; these are troublesome, how should they be welcome? Their strength is labour and sorrow. If their very strength, which is their best, be labour and grief, what is their worst?

As quoted in Spurgeon's Treasury of David.