I think you’re making a false comparison. Growth mindset is a separate thing entirely. “Growth” versus “fixed” in terms of ability to change your thought patterns.
It’s “scarcity mindset” vs. “abundance mindset”. In terms of ability to gain resources.
A scarcity minded person, such as myself, thinks that they should build extra buffer and not spend their resources, in case they need them in the future. If things go south, you might not be able to make money, so you should have extra somewhere to weather the storm. Resources flowing to you could become “scarce” (in your mind), so you’re cautious.
An abundance mindset person believes that they’ll always be able to find extra somewhere. They don’t need a big savings account because they’ll be able to figure out a way to make money, no matter the circumstance. Resources flowing to you are “abundant” (in your mind), so you are more carefree.
Neither is bad, they’re just different. If you’re older but still tucking away money and trying to not spend too much, etc, then you still have a scarcity mindset (like me).
I personally don’t know if my career will go away in the future, so I’m trying to build a nest-egg to be self sufficient regardless of my work, even though I have plenty of money in my budget to not think about it