I have a bunch of magnets (one of those game-board thingies) given to me when I was a school-going lad over 20 years ago, and the magnets feel just as strong as it was the day it was given.
As a corollary to this question Do magnets lose their magnetism?, is there a way to determine how long a permanent magnet will remain a magnet?
Addendum: Would two magnets remain a magnet for a shorter duration if they were glued in close proximity with like poles facing each other?
Answer
It loses some properties, but at a, for most practical usage cases, negligible rate. I remember the rate being in the order of 1% every decade or so.
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