"Oldest" is the superlative degree of the adjective "old".
Superlative form shows the highest degree among three or more things.
This is the easiest test I've taken.
"Easiest" is the correct superlative form of the adjective "easy" (easy → easier → easiest).
The structure follows the rule: "the + superlative adjective" (e.g., the tallest, the smartest, the easiest).
Smart, smarter, = smartest.
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