Feline Urinary Tract Disease. This group of conditions include kidney failure, kidney or bladder infections, kidney or bladder cancer, or kidney or bladder inflammation of various causes. Specifically here we want to address bladder infections/inflammation.
Urinary stones (uroliths) that form in the bladder or urethra. These can cause pain, blockages and often need to be removed surgically. Bacterial infections, which are uncommon in healthy cats but can occur in older cats or those with conditions like kidney disease or diabetes.
Cats suffering from feline urinary tract disease (FLUTD) often urinate outside of the litter box. Many only pass small amounts of urine that are often clouded or bloody. Bacteria cause classic urinary tract infections (UTIs), which require antibiotics to clear up.

As we can see from the illustration, Feline Urinary System Disease In Older Cats has many fascinating aspects to explore.
Congenital lower urinary tract diseases in cats can be heritable or acquired, affecting urinary function. Early detection and management of congenital anomalies can restore urinary function and prevent dysfunction.
Cats with chronic kidney disease (CKD) and hyperthyroidism often produce a more dilute urine (USG <1.030) which is a friendlier environment for bacteria. Unregulated diabetic cats often have glucose (sugar) in their urine which makes a nice culture medium for bacteria.

Bladder infections Cats older than 10, female cats, and cats with a metabolic disease such as diabetes are more likely to develop bacterial bladder infections, a less common FLUTD cause. Cancer Rarely, bladder tumors can cause urinary signs.
Age and Gender: Older cats and female cats are more prone to UTIs. Underlying Medical Conditions: Diabetes, kidney disease, or abnormalities in the urinary tract structure can predispose cats to UTIs.

Furthermore, visual representations like the one above help us fully grasp the concept of Feline Urinary System Disease In Older Cats.
Dental disease - Dental disease can also be a problem in older cats and many will require yearly dental cleaning. All types of dental disease occur in cats, but a common one at any age is called cervical line lesions.