You have no idea how much someone’s monthly expenses are based on their age. Someone 22 might be carrying 200k in student loan debt. Someone 45 might have their house fully paid off. Randomly guessing at someone’s monthly expenses is a really bad way to estimate how likely they are to stay.
For that matter, someone who keeps getting rejected for being “overqualified” might be extremely loyal once they find someone willing to give them a job.
Maybe? But you don’t know what those are so it doesn’t matter. Having family across the country is probably a bigger factor in how quickly someone will leave but you can’t account for that either, so just don’t try.
they "play in" only to the extent you can safely assume everyone has some monthly living expenses (food, shelter, etc). without knowing what the specifics are, you ... just don't know.
my monthly expenses are ... relatively low compared to lots of other folks my age and in my area and profession, but I do without some things they have (bigger house, newer car, newer cell phones, etc). We could tighten our belt even more if need be, but many others can't.
as in that other example, the 22 year old might be supporting massive student debt and maybe some consumer debt. That 48 year old developer might have a high earning spouse and together they're pulling in $240k in a medium cost of living area, with no debt.
You just can't tell by looking at someone's age what their financial situation is.
For that matter, someone who keeps getting rejected for being “overqualified” might be extremely loyal once they find someone willing to give them a job.