honda accord 1994 flickering lights

I have an Accord EX 1994 and, when the engine is in idle ~ 900 RPM the radio, clock, dash board lights/LEDs flicker; as sson as the RPM goes above 1000 RPM the lights are OK. Is this an alternator problem?? The current alternator is original (~14 years old). Should the alternator be replaced or it is a different problem. Thanks, NAB.