At high altitudes in Peru the pharmacies sell small personal bottles of oxygen, this can be a life saver if you have a severe case. The other thing in Peru that really helped was Coca tea, this would be hard to find here but I don't think it is illegal, same for chewing coca leaves. The Rolaids and Diamox are about it as far as I know as preventatives. Getting there early and getting in shape are the two best things you can do. With age you will acclimatize more slowly. Try to plan the big hikes for after you have been there a few days. Go early scout and set up a really nice camp for the guys who can't go early.
If you have even mild symptoms go to a lower elevation, if it gets severe you will not be able to get yourself to a lower elevation on your own.
