Final answer:
Warfarin is an anticoagulant used by many older adults and the INR should be regularly monitored.
Step-by-step explanation:
The anticoagulant used by many older adults that should be assessed or monitored is Warfarin. It is important to regularly monitor the INR (International Normalized Ratio) when taking Warfarin. The INR measures the speed of a particular pathway of coagulation and determines if blood is taking longer than usual to clot.