With a 20 year old car, it could be many things. Thermostat, Radiator, water pump, cooling fans not working, etc. Check for leaks.
Overheating can be caused by several things. A broken water pump, a sticking thermostat, clogged radiator, collapsed hose, bad radiator cap, air in cooling system. There could even be mechanical issues with the engine that cause this. Start by checking coolant flow. Is the top hose hot? if not it's the thermostat. If it is, with radiator cap off see if there is flow. If not, it's the radiator. If flow, purge air from the system (videos on line explain this simple procedure). This covers 90% of overheating problems. If this continues, you have an engine problem.
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