I have readhave read that references in a scientific researchpapers should be at leastno more than 2-3 years old, since such fields move too fast, and at leastno more than 10 years for arts or related fields:
A good rule of thumb is to use sources published in the past 10 years for research in the arts, humanities, literature, history, etc.
For faster-paced fields, sources published in the past 2-3 years is a good benchmark since these sources are more current and reflect the newest discoveries, theories, processes, or best practices.
However, I believe that's subjective, so how old is it for a reference to be "too old" to cite?