You are hereUCG.org / Sermons / Usefulness in Old Age Usefulness in Old Age Given on Oct 12, 2014 by Mitchell Knapp Listen Downloads MP3 Audio (10.86 MB) Downloads Usefulness in Old Age MP3 Audio (10.86 MB) × Usefulness in old age. Living in booths during Feast of Tabernacles has a purpose. It's like the School of Tabernacles where we learn the meaning of life.