The Android Ice Cream Sandwich (ICS) platform is seven years old and the active device count has been below 1% for some time. Consequently, we are deprecating support for ICS in future releases of Google Play services. For devices running ICS, the Google Play Store will no longer update Play Services APK beyond version 14.7.99.
Seven years seems reasonable.
…I still use my HTC Evo 3D from 2011 which is running under 4.0.3, because, well, it just works beautifully. So, well, I cannot call this planned obsolescence, but please don’t ever talk to me about ecology and waste disposals or I shove this device down your rectum. Google have never been good about Android updates anyway.