Around 10 years out the glue will fail, seemingly all at once. I have boots 20+ years old which are still great (stitched and nailed), but all the old shoes ju

Around 10 years out the glue will fail, seemingly all at once. I have boots 20+ years old which are still great (stitched and nailed), but all the old shoes just fall apart wherever they were glued (the sole usually). You can try to reglue, but it can be hard to get it smooth and walking on a lump ruins it.