Why is there an increase in urinary tract infections in men after 50 years of age?

The increase in urinary tract infections (UTIs) in men over the age of 50 is primarily linked to the obstruction of the urethra by the prostate, often due to benign prostatic hyperplasia (BPH). As men age, the prostate gland can enlarge, leading to a narrowing of the urethra. This obstruction can impede the complete emptying of the bladder, which creates a stagnant environment where bacteria can thrive, increasing the risk of infections.

Inadequate bladder emptying not only makes it easier for bacteria to multiply but also raises the likelihood of urinary retention conditions, which further contribute to the risk of UTIs. This anatomical and physiological change is a significant factor in the prevalence of UTIs among older men, making it a critical consideration in managing urinary health in this population.

Other options, while they may be associated with aging or health issues, do not directly address the specific causes leading to an increased likelihood of urinary infections related to prostate enlargement.