Rabbi Yitzḥak began: “Even when I am old and gray, God, do not forsake me” (Psalms 71:18) – Rabbi Aḥa said: Are old age and gray hair not synonymous? The explanation is that [David was saying:] ‘If You grant me old age, grant me gray hair.’7Grant me the visage of old age, which commands the respect due to older people. From whom can you learn this? From Abraham. Because it is written in his regard: “[For I love him, so that he will command his children and his household after him,] that they observe the way of the Lord, to perform righteousness and justice” (Genesis 18:19), he merited old age – “Abraham was old, advanced in years.”