Most people have no problem other than a headache and shortness of breath the first day or two. If you managed 12,000' (and that still isn't easy even working your way up) you'll be okay in Quito. Just don't expect to hit the ground running.
For what it s worth, we had no problems from the time we landed....
We flew in and had no problems apart from a little shortness of breath. Just take it easy for the first couple of days
Like others have said you shouldn´t have problems. My parents (in late 60´s from sea level) had no problem recently, just a little trouble walking up stairs.
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