Believe me, I know exactly what you're going through. Our laws against age discrimination in hiring are a joke. They provide no protection whatsoever for older people. None!
Here are my suggestions: I've noticed that even if you refuse to answer anything on your job application that can give out your age, there is still a much-bigger problem: online businesses put all of your personal information online for people to see for free! Look at a site called MyLife dot com. I guarantee you they have your age, full name, and a lot of other things on there. I recommend calling them (expect it to take at least 5 phone calls) and telling them to immediately remove your profile. There are other sites that do the same thing.
Anything on a job application that asks about your age, I think it's okay to lie. Yep: if they're going to discriminate against you because of your age,
then make up any age you want. You have something on your side that younger people may not have: job experience and life experience!
And beware of social workers: they don't help people in general these days. Instead, they only help people who have the specific problem that they concentrate on. If you want help from a social worker, ask and keep asking them until you find one that concentrates solely on helping elderly people obtain employment.