The father passed away from sudden cardiac arrest this week. Had he had a medical alert I'm not sure if it would have made a difference since it would have taken more than ten minutes for the paramedics to get to his home. Each minute a person looses 10% chance of survival. However, it would have made a difference if he had just fallen and got injured or had a heart attack which are survivable even if a person doesn't get help immediately.
His son and I watched the paramedics work on him. I knew it was too late. They tried for quite some time with the status of his heart still being the same.
So you were home when it happened. If you'd gotten your neighbour the panic alarm I suggested you could have helped him.