What does it mean if we had six months in your life?
What are
your memories of the U.S. Soviet Union-Soviet Union game in 1980, Seth? I
was also six months old when I got here my first day out! If
you asked to guess what the date you were six months old would he mean?
How simple is it to communicate or to get your point across?
When used with age, the all of signifies that someone was too young for something or doing something.
all of – As much as (often used ironically of an amount or quantity considered small by the speaker)
This means, he was too young to have memories.