Do permanent magnets lose strength over time?

[aegis]

I've heard conflicting reports. I guess the better question is: is the energy that's needed to create a magnet more than what you can extract from it overtime?

I am intrigued by magnet motors, but if the answer to this question is yes, I don't see the point in continuing to research this area.

[Localjoe]

So if it could run for 100 years... and then it lost a little strength it would that not be worth it?

[Honk]

Here's some earlier threads in this matter. Please read.
http://www.overunity.com/index.php/topic,2751.msg56551.html#msg56551
http://www.overunity.com/index.php/topic,2926.msg42805.html#msg42805

In normal use you loose 5-10% of strength in a 100 years. More like 5%.