A couple of verses from Psalms chapter 71. It talks about being 'old and gray' (fewer and fewer people get 'gray' any more, even the guys!):

"And now that I am old and gray, don't forsake me.

Give me time to tell this generation (and their children too) about all your mighty miracles.

Your power and goodness, Lord, reach to the highest heavens.

You have done such wonderful things.

Where is there another God like you!"

~ Psalm 71:18 & 19 LAB

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Bible Commentary:  "Solomon wrote that the glory of old people is their experience. A person is never too old to serve God, never too old to pray. Though age may stop us from certain physical activities, it need not end our desire to tell others (especially children) about all we have seen God do in the many years we've lived.

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