God must be very old, and therefore they depict a form of the Lord like a very old man. But in the same Brahma Samhita , that is contradicted: although He is the oldest of all living entities , He has His eternal form as a fresh youth.
"directly enacted from the spiritual platform, and thus this sound vibration surpasses all lower strata of consciousness - namely sensual, mental, and intellectual. As such anyone can take part in the chanting without any previous qualification." - A.C. Bhaktivedanta