Do magnets ever lose their magnetism?

If you heat a magnet up a little bit, it will lose some of its magnetism, but on returning to room temperature [depending on how high it was heated, and on the shape of the magnet itself], full magnetism can be restored. read more

Yes, it is possible for a permanent magnet to lose its magnetism. There are three common ways for this to occur: 1) Via heat: ferromagnet materials will lose their magnetism if heated above a point known as the Curie temperature. read more

In some cases permanet magnets can lose their magnetization. Several factors can contribute to the demagnetization of a magnet: strong reverse magnetic fields, very high temperatures, mechanical stress, and time. read more

The answer by DIYser is incomplete. If magnets are not interacting the time table he gives are reasonable. If they interact in any way , they lose magnetization. One can use a permanent magnet to magnetize iron for example. read more