Charles Spurgeon writes:
Some are like the sun going down in the west; they will be gone soon. Serve them, dear brethren. You that are in health and vigour, comfort them, strengthen them, and help them all you can. Be a joy to that dear old man, who has been spared to you even beyond the allotted threescore years and ten, and praise God for the grace that has upheld him through his long pilgrimage. Look on his grey hairs as a crown of glory; make his descent to the grave as easy as you can. He once was as young as you are; he once had the vigour that you have. Console him, cheer him, give him the respect that is due to his many years. Do not let him feel that you consider him an old fogey who lingers, superfluous, on the stage; but learn from his experience, imitate his perseverance, and ask God to be with you in your old age, as he is with him.
Excerpted from Charles Spurgeon's Own Funeral Sermon.