I'm 46 and have bad hips and an artificial knee, so I opted for the Amp Research Powersteps. Not a great option if you're doing any rock crawling or serious off road stuff, but for me they've proven to be an exceptional purchase (my off roading consists of light trails and getting to camping/hunting sites etc.). They're a bit pricey, but I can honestly say that my jeep is now proving to be the most comfortable vehicle I've experienced since my body started to head south on me. Prior to the Jeep I had a Lexus sedan and a BMW sedan, and getting in and out was becoming a running joke. I'd almost have to roll out the door to exit and getting in was more of a controlled splash-down (I'm 6'1, 200lbs). Now I just step up and sit. Easy as can be.
In any case, they may be an option for you. If you have any questions I'm happy to discuss them. Good luck.