You won't find very many older people who oppose public health care in Canada or Europe, Rig, but there is much immigration from the Third World to Canada and Europe. Immigration is a separate issue to health care.

The reason many older Americans oppose it is that they are ignorant of what it's like, fooled by corporate scare propaganda, and clinging to what they are already familiar with in fear of change. It's not uncommon for older people to fear change, and for younger people to support it. It's been happening that way ever since ancient Rome and Egypt, if not long before.