Microsoft dropped the ball so badly in the IE6 days that the difference between IE and Firefox was enormous, in terms of performance, stability, and features.
Android's browser was never in a position quite that bad.
Android's browser was never in a position quite that bad.
And yet Firefox, for a period of time, had trumped IE on Windows. And of course, Chrome trumps IE on Windows today.
Besides, the "age of the OS" doesn't matter -- the age of the users does, and younger users tend to be even more savvy and favorable of third party browsers.