Sr. Cat - leaking urine...

I just don't know what to do :confused: My oldest boy is 17-18 years old...it was a long time ago when he just 'showed' up (as have my other two boys). We've had a wonderful life together but what's been happening lately is he doesn't have good control and is leaking urine all over the house. And peeing in the wrong places too. We had a vet check - for his age, he's in pretty good health - my vet was quite surprised. But, there's nothing to do for 'leaking'. I try to watch where he is, but, ya just can't do that all day (and night!!) long. Any ideas out there??? And also...please share your favorite clean up products...I've tried Nature's Miracle - and a Urine Control Concentrate. I don't think I've found 'the best' yet as there are lingering odors. Thanks all!