Google had shut down the old features 'Google+ & Inbox' last week. Now, a new feature in the Google Cemetary site shows that the average life span of the discontinued/dead Google products is 4.1 years. The site has a table that shows you deaths yearwise, which shows that it discontinues once it buys other businesses. Google has discontinued over 150 products in the last 13 years. 2011 tops the chart with 26 discontinuations.