Stable is stable. It is a mountian. If age is as important to you as you say, it must have been raised up (due to instability) at some point.
12 million? Just using the same ‘dating methods’ used for all other ages guessed at.
The presence of faults is easy to determine. It is also easy to see that such a site would be preferable to located in a fault-less location.
Nice try at an ambush. You may try again.
This may come as a shock to you, but all 'dating methods' are not the same, and they are not all equally inaccurate, as defined by the most hyperbolic anectodotal incident you can find.