Twenty generations passed between Adam and Abraham without old age being mentioned once. Not because people didn't age — but because no one had earned the particular beauty of visible, dignified aging. Then Abraham appeared, and the verse says he was "old, coming with days" (Genesis 24:1). The phrase "coming with days" means something more than just "getting on in years" — each day had been lived fully enough to accumulate into something visible on his face.
Isaac after him, then Jacob — each received the same gift. The rabbis said that Isaac, at a certain age, asked God to make the distinction between youth and old age visible, so that a father could be honored as a father. God agreed, and the lines appeared on Isaac's face first. Before that, father and son looked indistinguishable. After it, you could see the generations in the room.
Psalm 102 adds the spiritual dimension: "He will regard the prayer of the destitute, and not despise their prayer" (Psalm 102:17). The only path to this level of prayer, the midrash says, runs through old age — through the accumulation of loss and survival, through the decades in which a person learns what they cannot control and what they can ask for. Old age in the Torah is not a decline. It is an achievement. The "coming with days" is the sign that someone has been paying attention.
Chapter 39: Writings [1] A song of ascents. I lift up my eyes to the mountains— where does my help come from? My help comes from the Lord, the Maker of heaven and earth. (Psalm 121:1-2) Blessed are the people of Israel when they do the will of the Lord, as they are elevated like ministering angels, as it is said, "And the Lord will make you the head and not the tail; you shall be only at the top, and not at the bottom" (Deuteronomy 28:13). The phrase "only at the top" is not written here, but rather "at the top." What does "only" signify? It means that sometimes you are above, but when you listen to the voice of the Lord and fulfill His commandments, as it is written, "if you listen to the voice of the Lord your God" (Deuteronomy 28:13), you are always elevated. However, if you don't follow His will, you are sometimes below, as it is written, "And the stranger who is among you shall rise higher and higher above you, and you shall come down lower and lower" (Deuteronomy 28:43). This is also what God promised to Abraham when He said, "Look now toward heaven and count the stars if you are able to number them.... So shall your descendants be" (Genesis 15:5). In another place, He says, "And your descendants shall be like the dust of the earth" (Genesis 28:14). Why did He say "dust" if He had already said "stars"? He meant that when your children do My will, just as the stars are above all the world, so too will your children be above all, but when they do not do My will, just like the dust is below, so too will they be below. As it says, "For the king of Aram has destroyed your people and made them like the dust in threshing" (2 Kings 13:7). He said to Abraham, "And so you leave them," but Abraham replied, "Are You not the One who sustains them?" As it is written, "Rise up and shake off the dust" (Isaiah 52:2). The generations said to him, "Master of the Universe, the time of the end and the appointed time has arrived." Therefore, David said, "I will lift up my eyes to the hills, from where does my help come? My help comes from the Lord, who made heaven and earth." (Psalms 121:1-2)