Learner's definition of AGO
: in the past : before the present time : before now
“How long ago did she arrive?” “A few hours ago.”
That culture flourished here over 10,000 years ago.
We met three months ago and we'll meet again three months from now.
He long ago learned to be patient.
I saw an interesting ad not long ago [=recently] for a new car.
All the good tickets were sold a long time ago. = All the good tickets were sold (quite) some time ago.