The USA didn't fare too well in LIFE Magazine's recent profiles of the top ten move livable cities in the world which featured no US cities. However Canada, our neighbor to the north, managed to score 3 of the ten spots with Toronto, Ontario, Vancouver British Columbia, and Calgary, Alberta.
But before you renounce citizenship or get a passport (now required for trips to Canada) and pack your bags keep in mind that it gets pretty darn cold in Toronto and Calgary. Personally that fact alone would lower those cities off my own list of favored retirement areas which would certainly include an option for an Oregon Retirement . I'd also certainly have San Diego California on my list where the weather is about as good as it can get year-round and the amenities are spectacular.