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The surf on the coast had not changed although I had grown older.

Is the sentence grammatically correct and meaningful? And I'd like to know whether I should use the verb 'change' in the past perfect tense.

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anonymousIs the sentence grammatically correct and meaningful?

Yes, it is.

anonymousAnd I'd like to know whether I should use the verb 'change' in the past perfect tense.

If you're talking about a time in the past, then it's okay.