Customer Last login date

Hi, Not sure if im posting this is the wrong location but i need a way to view the last date that registered customers last logged in so that i can delete old account information. so that if a customer does not login for 1 year i can identify them and delete there account. This is to try and keep my database tidy but also so that i am not storing customer information (name address ect) that i don't need. does anyone know of a mod or report that i can install?
Thanks in advance