The purpose of Regulation B is to prevent discrimination on a prohibited basis in any aspect of a "credit" transaction.
Not collecting the age could be tricky to avoid age discrimination, even for a well-intentioned bank. How would you prove that you are lending to individuals of legal age to enter into an agreement? The regulation allows a bank to treat applicant age 62 and older more favorably than those age 61 and younger, but any other age difference is illegal. Reverse mortgage programs requires the borrower to be 62 or older. How would you prove that you were not discriminating based on age?
Marital status..I think would be the same. Proponents of the law believe divorced women were being treated particularly unfairly by lenders. How would you prove that you are not discriminating....
I would think that it is best to collect both. \
Then again, would the examiners prove it????