I have no doubt you can do it! With the determination to obtain the weights you have achieved you'll be able to get to whatever you point you want to make your 50's the best yet.
Oh, I found a cool little post today about weightlifting and how taxing it really is on the body of these guys. One of the athletes of Muscle Drive USA teaches our Olympic Lifting classes at my CrossFit gym, so this is a really cool article ...
The Outlaw Way