My car engine stopped while driving. When I tried starting it, it wouldn't start

Could be a number od different reasons. If the engine is cranking over(starter motor turns engine when you turn key) first thing that comes to my mind due to the age is a failed timing belt. You may even notice that the engine appears to sound different when trying to start (engine spins faster due to lack of compression) Best call for a tow and have it taken to a reliable shop/technician.