Immobile hips are one of the biggest problems people may develop as they age. Studies have shown that hip mobility is an indicator of longevity!
The problem becomes evident when people start to experience discomfort or pain in the back or knees. If the hips can't move properly, the rest of the body will suffer.
I experienced this in my mid 40's. It is what prompted me to look for ways to change the way I trained, which led me to Mobility related work. By my early 50's I was moving much better but was still unable to comfortably sit in this 90/90 position.
at 53, I attended the FRC (Functional Range Conditioning) certification. The scientific principles used by this system were the "cherry on top" of all other mobility related work I had done. By applying these principles in a steady, progressive manner over an extended period of time I have made improvements I couldn't imagine.
Now, at the age of 58, I am exploring multiple ranges within my hips that I had started losing 30 years ago. My hips, along with the rest of my body, are feeling better than they have for as long as I can remember!
I am still making progress and strive to move even better in my mid 60's! Mobility, especially in the hips, gives one freedom of movement. And Movement is life!