As a kid I would hear “save big money” and would often show a person next to oversized money (like cartoon people next to giant dollars and coins).
I was absolutely under the impression it meant large scale money and found it confusing anyone would want that. It would be so inconvenient!
I’m not sure when I figured it out but it wasn’t an “a-ha!” moment, it just sort of gradually fell out of my brainmeat.
It can change, mostly related to health. For example viruses and diseases can alter iris color.
If it’s cloudy and dull it may also be early stage of clouding of your lenses (cataract).
If you haven’t seen an optometrist recently, you may want to get checked, just to be safe, they can rule out any ongoing problems :)
https://health.clevelandclinic.org/can-eye-color-change