I recently came across this sentence in my English class and found it a little weird.
It said, "A girl of about nine years old had recently described ..."
Often I hear people say "a girl about nine years old" or "a nine year old girl" or in such structures alike. I don't find the "someone of something" so weird, but I don't think this expression is employed so much, I typed the exact phrase on Google, but came up with no uses.
As far as I know, people say things like "a man of experience", or "a man of 40 years of experience", but I've never heard such thing as "a man of 40 years old". It sounds really strange to me.
Is this expression right?