Context: "Old Man" is a song written and performed by Neil Young on his 1972 album Harvest. "Old Man" was released as a single on Reprise Records in the spring of 1972, and reached # 31 on the Billboard Hot 100 singles chart for the week ending June 3.\n\nQuestion: who wrote old man look at my life?
Let’s work this out in a step by step way to be sure we have the right answer.
Neil Young
The relevant sentence in the passage is: "Old Man" is a song written and performed by Neil Young on his 1972 album Harvest.

"Old Man" was released as a single on Reprise Records in the spring of 1972, and reached # 31 on the Billboard Hot 100 singles chart for the week ending June 3.

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So, the answer is Neil Young