age shows a duration or age of files in human readable text. Examples: 1. When did I installed chrome? $ age chrome /usr/local/bin/chrome: 1 day 20 hours 35 minutes 26 seconds 2. How long has it been since epoch? $ date Wed Jan 27 10:46:07 MYT 2010 $ age -s 0 40 years 36 days 2 hours 46 minutes 7 seconds 3. Is it true that there are 31536000 seconds in one non-leap year? $ age -t -d 31536000 1 year