Fifth Gear did a really freaky test when they crash tested 1995-96 Renault Espace minivan against a 2003-04 one, to show how much crash protection technology has changed over 8-9 years. Tt was frightening. The new model pretty much ripped into the older one in an off-set driver's side crash, and sustained surprisingly little damage - the seatbelt pretensioners fired, but the airbags didn't as the new model didn't feel the impact was severe enough - the pretensioned seatbelts held everyone so securely in place, there was no need for airbags. The older van was a complete mess; the drivers legs would have been severed, and he would have bled out before help could have arrived.
Scary stuff. Makes one even think twice about buying a classic 50s or 60s car for weekend fun...