Huge difference. CA companies and investors (e.g. YC) specifically require your age to the interviewers. Using YC as an example, many interviewers are happy to publicly boast about using age as primary factor - I can link to to some comments written here on HN.

In some other places, e.g. NYC, this is all generally believed to be highly legally-risky and no respectable employer would ever consider doing it.

Shame on you CA.