https://old.reddit.com/r/Steam/comments/1i5brpb/whats_the_oldest_last_played_game_you_have_on/
Like it's this option.
mine was Just Cause 2. I recall being absolutely pissed that I need to fricking install some shit called Steam with my limited INTERNET DATA cap in addition to the files on my CD. 
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I think this is when the tracking was added because I have a lot of games I played that don't show a last played date.
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