Art,
If any of the following apply then you are required to file in CA.
Amount of time you spend in California versus amount of time you spend outside California
Location of your spouse/RDP and children
Location of your principal residence
State that issued your driver’s license
State where your vehicles are registered
State in which you maintain your professional licenses
State in which you are registered to vote
Location of the banks where you maintain accounts
The origination point of your financial transactions
Location of your medical professionals and other healthcare providers (doctors, dentists etc.), accountants, and attorneys
Location of your social ties, such as your place of worship, professional associations, or social and country clubs of which you are a member
Location of your real estate property and investments
Permanence of your work assignments in California
My guess is you use BoA there and maybe still a DL.
They tried to get me in '68 and told them I left in '66 to join USAF. Plus income was nontaxable because of Vietnam. Never moved back or renewed DL, etc.
Chuck