Membership for runescape was introduced feb. 2002, so in theory some players may have had membership for 10 years consecutively, but I'm tending to agree it will follow 5 year vet cape, and go by date of creation rather than date of first membership. The only potential problem with that is Jagex does not have any records on accounts created during 2001. Records start once membership was introduced. So for extremely old accounts created in 2001, according to Jagex, they'd have been around since 2002 if they subscribed to members when it first came out.