Yes, ‘old’ is indeed an adjective. It is used to describe something that has existed for a long time, indicating its age. Adjectives are words that modify nouns and provide more information about them, such as size, color, or age.
In the case of ‘old’, it helps us understand the time span of a noun, whether it be an object, person, or concept. For example, when we say ‘old car’, the adjective ‘old’ tells us that the car has been around for a significant period, distinguishing it from a new car. Thus, ‘old’ effectively communicates specific details about the noun it describes.