I've always worn Nike shoes because they're comfortable on my feet. What I hate about Nike shoes is that they don't last very long. I'm 80 years old so, not as active as I was 20 years ago. EVERY pair of Nike shoes I've worn for the last 20 years has self destructed. The soles detach from the shoe and that's it. I've tried flex glue and other useless remedies. What is it that causes the soles to detach?