It depends completely on how you live in them. If you do construction, you can easily do in four months what an engineer migh not do in three years. Looking at jeans as finished pieces at any point is fairly silly. Stupid marketing shit about living breathing indigo (with nation states and economic sovereignty in 45rpm's S/S 07 line!) aside, they are pretty much constantly changing. Of course, this is true of all clothes (and, indeed, all physical objects, to an extent), but it is particularly apparent with jeans because of the fabric and the dye. Heraclitean pants, if you like. Anyway, whodini's right. Just wear them. If you want crazy fades, I guess it's time you picked up a hobby like trail running or the French Foreign Legion.