Is there a way out of a written contract made in the Caymans?

I began investing with a bank in the Cayman Islands years ago, with the written agreement that I would be unable to access the funds until the age of 65.  I am now 58 and suffering from severe Parkinson’s disease and lupus.  Is there any way to contest the agreement and get access to my funds?  I have millions in the bank and can’t even pay for my medication here in the States, because the money is out of reach.  Please let me know if you think I have a case. I sent proof of disability to the Board of Directors but they continue to refuse me access.