I'm not older (30), but have been training for eons and using increasingly heavy weights (way above your regular gym rat). I've had not a single injury, while many people I've met on the way, younger and older - were/are constantly complaining about their knee/elbow/shoulder/back pains (and most of them are half as strong). And I have my theory why: I've started lifting with very light weights, built my base for about ten years of strict training, poundages increased very gradually, giving enough time for connective tissues to get stronger, later on I started some gear and my strength went to another level, still took my time to raise the weights, step by step (while my training partners were fucking up their shoulders and getting muscle tears, after encountering steroids and new strength). Two: I started doing very strict warmups after about two years of lifting (I knew I'm in for a long run), religiously. My regular warm up takes about 15mins, no excuses. For legs it may take twenty minutes, depends. That and probably genetics (no issues with joints in family tree). Have been pretty flexible always too, probably good.
Main thing - if your warm up takes less than 10mins of active movements - you are asking for injuries, simple as that.
Hope this helps