I'm in a similar situation myself. Dec 2007 (I was 31) I was hit head on by an 82 year grandma doing 55+. She crossed over and slammed me. Needed to be cut out of my van. Opened the side like a can and then had to cut my seat at the base to get me out from under the dash. Shattered my left femur and my right ankle and fractured my right wrist. 10 hours of reconstructive surgery and 1 1/2 months between 3 different facilities - a hospital, a nursing home and finally a rehab hospital. 8-10 screws in my knee, 4 in my hip and a plate running the distance. 2 plates and about 8 screws in my ankle. All removed now, sans a screw in my knee that got completely encased in bone.
Had to learn how to walk again and everything. I have little to no tolerance for anything that I used to enjoy. The few times I have gone to Six Flags or to Summerfest in Milwaukee it's a nightmare. I'm nearly in tears by the end of the day and running on pure adrenaline to get to the car and sit. I should be in an adult softball league now but I can't run. A fast walk is about my max.
I'm 42 but my body is about 62. When I am at a concert and have to stand, my right ankle/foot goes numb from standing. I have to constantly move as much as possible to keep from falling over.
The only good news is that I continue to beat the odds. My left knee was supposed to go about 8 years ago but instead I keep getting stronger. I even grew back more bone then expected for my age at the time. Honestly, my ankle is far worse than my knee.
I do the old guy thing and have been in a bowling league for 8 or 9 years now. That was fun the first few years since I couldn't plant on my left leg. I looked bizarre. Within the last 2 or 3 years I was finally able to plant properly. Like I said, getting stronger for no good reason.
Anyway, that's most of my story. Body is much older than it should be.