Registration here in Tennessee, USA, is on the month anniversary of the first registration of the vehicle with the current owner, usually the purchase date. This spatters my registrations rather randomly through the year. While it spreads the payments out, it also makes it easy to miss a renewal.
One of the games we play when a bunch of bikes gather is to look for whose registration has dropped. It is always somebody.
Also, here in Tennessee, a 25 year old vehicle is eligible for a one time, permanent "antique" registration. Special use restrictions apply (not supposed to be commuting on a daily basis etc).
Next year, mySport is eligible.