The best replacement for ago is before.

The best alternatives to ago are rated as following:
★★★★★  before
★★★★  back
★★  earlier
★★  while ago
★  before difference
★  today
★  atmos
★  years back
★  some time ago
★  sometime back
  since
  long time ago
  women today
  not too long ago
  awhile ago
  now
  sometime ago

Your alternative for ago is not listed? Suggest!
Speaking about ago, one probably shouldn't forget about past perfect.

Other search terms related to ago and their ratings are:
★★★★★ past perfect
★★★ present perfect
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Google Trends

Scale is based on the average worldwide traffic of ago in all years. Click on graph for more.
ago
before
back