Bar on passport

I am not clear about your caption "Bar on passport." In general, anyone who is qualified for a tourist (B) visa may visit the US, as long as the consular officer is satisfied that strong ties exist to the home country, meaning that the applicant is likely to return. Consult with an immigration attorney for specifics applicable to your case.

it is not clear what you are asking. You should provide more details.

Anyone who applies for and gets a visa or eligible for a VWP can visit. There is no discrimination based on age.

Yes, it is possible. This person should consult with an attorney.

Sure, and an immigration lawyer can help with it

Your question is a bit vague as the US does not discriminate because of age. Assuming there are no other issues and you are coming to visit and have ties to your home country it should be possible. Perhaps a consultation with a qualified immigration attorney can help you.

Your question is a bit unclear. Age does not bar a person from visiting the United States. Close relative status does not necessarily entitle one to obtain a visitor visa. In fact, sometimes close relative status may bar someone from obtaining a visitor visa, as it may be presumed the person is coming to remain in the United States with a relative, and not just as a visitor. As for your "bar on passport", I am not sure what you are asking. Was the person previously denied a visitor visa, with some sort of prohibitive stamp in the passport? Anyone approved for a visitor visa may come to the United States; nevertheless, if the visitor visa was obtained by not disclosing certain relationships to US citizens, or not providing substantial evidence the person intends to return, the visa could be revoked at the airport.