For none of us liveth to himself, and no man dieth to himself. – Romans 14:7

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.

The second portion of our generation which we can serve is the part that is shining. I mean those in middle life, who are like the sun at its zenith. They are working hard, bearing the burden and heat of the day; as yet their bones are full of marrow, and they are strong men ready for service for the Lord. Seek to sustain their hands in every possible way. Help them all you can…Suffer nothing to be left undone which may further the work of Christ or help the people around you who are so quickly passing away…Let it be everybody’s ambition to try to make up what shall be lacking through their departure. This is what is due to those who are like the shining part of our generation.

Specially, however, I want to speak to you about serving your own generation in the part that is rising; the young people who are like the sun in the east, as yet scarcely above the horizon. This part of our generation is specially the care of parents and Sunday-school teachers; but let us not leave it entirely to them. We can, most of us, do something to serve this portion of our generation before we fall asleep. Beloved, I commend to your care and attention the children and young people who abound in our midst. In them lies our hope for the future of God’s cause on earth. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/2243.cfm