A: What are your memories of the U. S. - Soviet Union game in 1980, Seth? ;-)
B: I was all of six months old that day. ;)
Does he mean he's exactly six months old that day?
3
1
When used with age, the all of means that someone is or 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.
-
This can be more generally used when you want to say that you don't have much of something in a slightly jokey way. "I can't come out to the cinema, I have all of £10 left in my account!" – TarkaDaal Aug 6 '14 at 12:12
