Isolating every old person might be hard.  We might need to concentrate them in some kind of camp to make enforcment easier (its for their own good). And obesity is also a risk factor so maybe we should lock fat people down (or up) too.  And come to think of it the unvaxinated are also much more likely to get seriously sick so why don't we lock them "down" while we're at it.  Then the rest of us can go about or lives without our liberties being infringed!  Sounds like a solution to me.