There doesn't seem to be an age limit on this which is interesting. Someone posted a worker visa website the other day and some of them had age limits like applicant has to be < 35 yo.
For example, the Cayman Islands had a pandemic program that required staying at certain bubble properties, which were like $10,000 per interval. Not sure what the interval was, but it was expensive and would accomplish the gatekeeping.
I immigrated in my current country at 26 and it was really easy and warm, and they did everything to quadruple my salary from the european country I came from.
Now that I'm close to permanent residency and 33, I'm thinking of jumping again, but with a kid, an giganormous salary and a lot of money to be picky, I expect to be more a burden for the next country than an obvious cheap asset.