My Adsense account was approved on the year 2011. I earned money with it from 2011 to 2012 through niche sites getting traffic from search engines. The year 2012 was also the year of the first penguin update. The update affected all of my sites and suddenly put a halt to my earnings.
Since 2012, I had not used Adsense in making money online until this year. So from 2011 to 2012 and 2016, my Adsense account lifetime ad impressions hit 1 million.
Google was kind enough to remind me of this small milestone. Thanks G!