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Why people think credits expire
The belief usually comes from somewhere real, which is why it is so persistent.
College credits sometimes do carry time limits, particularly in fields where the content dates — technology, some sciences, professional programs with licensure attached. A student who heard that rule applied to a degree reasonably assumes it applies to high school too.
Individual schools also sometimes have policies that look like expiry. And a transcript that has genuinely been lost feels, to the person who cannot find it, exactly like a credit that has expired. The outcome is similar; the cause is completely different, and only one of them is fixable.
What actually decides whether a credit counts
Three things, none of which is the year.
Whether it is documented. An official transcript from the issuing school is what makes a credit evaluable. This is the one that stops most people, and it is the one that can be solved.
Whether it was completed and passed. Enrolled-but-not-completed does not transfer. Partial years often transfer in part.
Whether it maps to a subject requirement. Graduation here needs 24 credits across specific subject areas. A credit that does not map to any of them may still count toward electives.
Nothing in that list is a date. How the credit review works covers the process.
If the school you attended has closed
Closure does not destroy your record. Records are transferred, usually to the district, sometimes to a state department of education.
This is worth stressing because the assumption that a closed school means lost credits sends people back to zero unnecessarily. The record almost always exists somewhere; it is a matter of finding out where it went.
Getting transcripts from a closed school sets out who to contact and in what order.
What to do if the record is genuinely gone
Occasionally it is. A fire, a flood, a school that closed badly, a record that was never properly filed.
If that is your situation, say so plainly when you apply. An honest account of what you completed and when, with whatever secondary evidence you have — report cards, a graduation program, correspondence — is something a review can work with. It may not produce transferred credits, but it will produce a realistic plan.
What does not help is guessing at credits you cannot evidence. A plan built on a hopeful number falls apart in month three, which is worse than starting from an honest zero.