- She had beaten off the disease five years ago after a melanoma had been found on her leg.
- He hopes to jog a few memories in January by picking up where he left off five months ago.
- It was like a minute ago that I talked to Natalie and now I am on my way in my Jaguar to get her.
Middle English ago, agone, past participle of the obsolete verb ago 'pass', used to express passage of time.
When ago is followed by a clause, the clause is normally introduced by that rather than since: it was sixty years ago that I left this place (not it was sixty years ago since I left this place). The use of since is redundant and is not correct in standard English.