Can a credit card company request payment on a 6-year-old debt if you live in Ireland?
Yes. A creditor can request (even demand) payment of any debt
regardless of the length of time or the status of the debtor, (even
a deceased one). Whether or not the creditor has legal grounds to
instigate litigation against the debtor so that the debtor's
personal or real property can be attached or seized, is an entirely