"So what you have is a large, relatively affluent population that is aging and they don't want to work at MacDonalds. But they want their MacDonalds Drive Up Window"
As a younger man I knew plenty of friends that had their first job there. There's many young kids that would fill that position.
I'm sure they would. They should apply. They will get the jobs. But if you didn't have immigration there just wouldn't be as many MacDonalds. That might be a good thing but just imagine life where you had to drive 5 miles to the nearest MacDonalds. Hmmmm. Actually I think I would like that.