There could be a couple of things going on. I would be concerned about diabetes or a thyroid condition that might be causing the increased thirst and urination. At this age, it's definitely a possibility.
You will also see some inappropriate urination if there has been a spinal injury or there is spinal pain (from arthritis, etc).
At this age, there are many things that can go wrong, unfortunately.
Stones or urinary "sand" can be the cause of undiagnosed urinary disorders. UTI's are also common. A culture can rule this out. I would look more closely at diabetes and thyroid conditions as the cause.
Let me know if you still have questions.
