I (31M) recently completed my PhD and a postdoc position. I didn't make much money during that period, about 26k annually for my PhD, and about 32k while I was working as a postdoc. My wife (30F), who I married about when I got my PhD, makes a sh*tload more than me, or made a sh*tload more than me.
She made about 100k while we were together, so quite a bit of a gap. She also came up with the idea that we should put some of our income for ourselves and some for the family, and this would be proportional to our income, to keep it 'fair'.
She always got a bit fancier stuff than me, and I was pretty jealous. I didn't voice it to her, which I guess I should've, but I don't understand how she doesn't realize it.
I don't want to reveal too much information, but while I was working as a postdoc, I made connections with a couple people who were starting up a company. Long story short, last year I made 300k without including my stake in the company. It is obviously risky, but I think the risk had paid off for me at least.