I'm 86 years old and on Plavix (clopidogrel). I need three molars pulled. The dentist says I should stop taking my plavix (clopidogrel) for three days and all will be ok.?

You should be fine. OK to stop Plavix (clopidogrel) for 3 days, but you should have a pre surgery course of antibiotics. Check with your primary care provider or your cardiologist.
Yes. You must stop the Plavix so that you can heal properly after your extractions. Just for your confidence, check with your physician for his approval.