My car isn't old, it's just getting broken in!
Late to the Miata world, I purchased my 1995 Brilliant Black in August of 1998 with 32,000 miles on the odometer.
The odometer turned 100K on the IMS track. Having carefully planned this event, the odometer turned over to 100,000 as I crossed the famed yard of bricks in May of 2006 and I've got a picture to prove it! My personal 100K miles driven in the car came in 2008. Not sure where I was, I do remember looking down and thinking, "I've driven 100K in my Miata!"
My car and I have been to New England, Canada, all over the midwest.... I have slowed down a bit putting miles on the car and am currently sitting at 179,850. (Just getting broken in!) I am always looking for good drives to add to that total!
I really do think that owning and driving a Miata is the most fun you can have with your clothes on.