Property devalue question

I am a first home buyer. I've had a look at a property that's about 40 years old. Just wondering how would the property devalues after 20 or 30 years. If I am to resell the property in the next 10 years, it will be 50 years old. Will it make it hard to resell?

What will happen to the property that is 70 years old? Will the entire building be restructured or do buildings generally last more than that?
 
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