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Hello, this is Dr. Jess. I am sorry to hear about your troubles with your kitty. I have a few questions for you to help better answer your question:
So in an older cat, there are several different things we worry about in kitties that are urinating outside the litter box. We can have something as simple as a urinary tract infection, which can be treated with antibiotics. This can sometimes cause a kitty's urine to have a bad odor (though not always).
We also worry about diseases such as kidney disease, hyperthyroidism, and diabetes, which can all cause increased urination leading to accidents outside the litter box. These can also lead to weight loss (though in older cats we can sometimes have loss of weight just due to decreased muscle mass as a pet ages).
The only way to determine if this is a medical issue versus a loss of litter box training due to senility or behavior would be to do some testing, including a urinalysis and bloodwork. I would recommend setting up at appointment with your vet soon, since the problem has been going on for several months.
Please let me know if you get this reply and if you have any additional questions!
Just following up to see how your kitty is doing and if you got my response to your question?