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plural of year. quotations examples
It will be a shorter book and it will not start four million years ago.
1981, May 5 1718-PDT, Jim McGrath, Earliest Usenet use via Google Groups: fa.sf-lovers, said with a smile at an awards ceremony in the Pennsylvania state Capitol
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.
2013 September-October, Katie L. Burke, “In the News”, in American Scientist
plural only
(colloquial, hyperbolic) A very long time. examples