You change your phone as often as you change you pants...
On you getting an Android Phone, why would you care if your Android Phone wasn't updated in 18 months, You'd be getting a new phone before that anyway.
Ok peter, why do you care?
You make a rational decision of what is available at the moment, but you have that 18 month non-upgrade ding against it.
Not saying you should get an android, just it may be worth looking at yet you won't.
When was the last time you went 18 month without a new phone?