I don't really walk a lot. I use a bike as my transport means, but even before riding it, I use to tear my jeans quite soon, for instance as in this picture. They usually split sooner as 18 months with the following approximate frequency of use: I use them 4 times per month, i.e. 4x12x1.5=72 times were they worn; I washed them like once a month, i.e. washing them 18 times. That's the only spot my jeans are actually worn out, whence I don't want to throw them.
There are some hints as how to repair them but I'd like to know, if it's possible to avoid the formation of those holes.