I know I may get a lot of criticism for this.
Male cat had him for 18 years. Initially was an indoor cat then we moved house and he's been living in a house with access to lots of land to roam in a house of 3 children. Much loved but very low maintenance. He has always been incredibly healthy and have never had to take him to the vets. Eats dried food only and gets flea and worm treatment.
He now is sleeping all day (and all night) awake for short periods only. His back legs occasionally don't work properly when he gets up after sleeping and he has now started weeing all over the house (previously would do this outdoors) this morning I caught him trying to have a poo on my kids football boots.
I know he is old and isn't likely to live many more years, however how do I know when it's time? Is the above enough to warrant a trip to the vets?