title: What's the best way to detect Android devices made before 2012?
body: <p>For my app, I want 3 categories of performance: </p>
  
  <p>"BASELINE_CONSTRAINED"  - for older devices, made before 2012 </p>
  
  <p>"BASELINE" - 2012-2013 ..."now" ..."standard"</p>
  
  <p>"BASELINE_EXTENDED" - High-end devices, bleeding edge. </p>
  
  <p>I've done this on iOS no problem -- less devices to wrangle, so I can specifically set by device ID. </p>
  
  <p>But with 4000+ device types on Android, what's the best way to find devices by "ship date"? </p>
  
  <p>Thoughts: 
  - Some combination of DPI and Screen Size?
  - Android SDK X   ...but people can upgrade
  - Processor speed? 
  - how about build.prop "date"  ->  ro.build.date=Sat Nov 17 16:10:21 GMT 2012</p>
  
  <p>Thanks in advance!</p>