GPS, RFID, and designer-tech medical technology has the potential to help the old and frail live independently for much longer than they thought possible.

But stuff like implantable RFID is still evolving, says a report released this week by MedAmerica Insurance Company.

"A primary challenge remains in ensuring that devices are used effectively," said Patricia Bomba, M.D., F.A.C.P., geriatrician and medical director for MedAmerica Insurance Company. "Alzheimer's patients may not remember to bring a device like the Activity Compass with them, or they may refuse to wear a pin, bracelet or necklace."