Add -er for the comparative and -st for the superlative.
Use the comparative with dan (ouder dan…) and the superlative with het (het oudste).
The comparative (vergrotende trap) of oud is ouder. Add -er for the comparative and -st for the superlative. Use it with 'dan': ...ouder dan...
The superlative (overtreffende trap) of oud is oudst, usually used as het oudste.
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