You should wash your jeans after every 9 to 10 washes

It is such a cringe question but one of my colleagues commented that my jeans look old and I should throw them out. I bought them 7 years ago from Levi's and wear them almost everyday. Ofcourse, they are faded from the navy blue that they were to a more whitish blue and it is quite worn out. I thought it added to the appeal. I mean I can throw them out right now( they only cost me 2.5k back then) but I wonder what is the lifecycle of jeans for most people here.

My all t shirts of good brands fades in colour after multiple wash and looks very bad from original colour. Is there any brand whose colour don't fade. Say even after 20-30 wash. Ya Aisa kapda hi nhi Bana Abhi tak.