I come across this while browsing Bitcointalk Member Ranks

https://bitcointalk.org/index.php?topic=178608.0

+

Seems you could turn Legendary anytime from a certain amount of activity to another.

Legendary:

Activity: the Legendary membergroup has no universal activity requirement.
You are guaranteed to become Legendary somewhere between 775 and 1030 activity,
but the exact point in this range at which you become Legendary is random per user.
Gets 5 gold coins under his name of which the last is half dark blue.