Apparently those solar eclipse glasses have an expiration date of 3 years, so it would probably be best NOT to save them for 2024. However, Astronomers Without Borders will be recycling them for distribution in South American and Asia in 2019. More on that later.
http://www.popularmechanics.com/space/solar-system/a27853/missed-total-solar-eclipse-next-2024/
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