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Well... Museums are often home to old stuff--paintings from long-dead famous artists, Egyptian artifacts, and so on.If I bought a huge empty warehouse and put up a sign stating 'Air and Space Museum' and charged $5.00 to tour it ?
How old air is is a tricky one due to the nitrogen cycle, but the oxygen and nitrogen atoms themselves will date back to whatever supernova produced them, so 5 billion years or older.Calling it an 'Air and Space Museum' would likely lead visitors to believe they'll see old air and space...