The best replacement for years is year's.

The best alternatives to years are rated as following:
★★★★★  year's
★★★★★  human years
★★★★  people years
★★★  human
★★  dog years
★★  year's experience
★★  year's grammar
★★  cat years
★  months on resume
★  grades
★  light years
★  happy new year
★  bush years
★  years' experience
★  years
★  30 years
★  year grammar
★  new year's
★  current years
★  primary pgce
  general primary
  earth years
  couple of years
  this year's
  15 years mortgage
  10 years
  freehold
  saturn years
  calendar years

Your alternative for years is not listed? Suggest!
Speaking about years, one probably shouldn't forget about apostrophe.

Other search terms related to years and their ratings are:
★★★★★ apostrophe
★★★ food and water
You have in mind a companion for years and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of years in all years. Click on graph for more.
years
year's
human years