Credit History To keep your average age of credit history up, make sure you keep any card that has no annual fee, even if it goes unused. (blog.tortugabackpacks.com)
The average age of your credit card accounts can also affect your credit score. (lendedu.com)
The logic behind this piece of misguided advice seems sound at first: The average age of your credit lines affects your credit score, and the older, the better. (businessinsider.com)