ago

 
Pronunciation: /əˈgəʊ/

adverb

  • before the present; earlier (used with a measurement of time): he went five minutes ago two years ago his parents moved house as long ago as 1942 not long ago he came across a rattlesnake outside his house

Origin:

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 should be introduced by that rather than since, e.g. 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 not correct in standard English.