How do you get wealth without money? You need to start by chasing money…
You generally can't know for certain, except in some cases such as a public figure. Lots of people expend vast amounts of energy projecting the image of wealth in a [pathetic] attempt to gain status, and they're faking it to the max.
As the saying goes:
"Mo' money, mo' problems."
Some years ago my wife was talking about a poor family we know: while looking their finacnces over realised if you subtract 401k (which they don't have) and house payment (my house was a lot nicer, though both of us should have it paid for in 30 years) I actually have less take home pay to live on in a month. Of course that difference means a nicer house to live in, and a very comfortable retirement plan.