Which system sees a decrease in muscle tone of the bladder and issues with incontinence as it ages?

The urinary system is responsible for the storage and elimination of urine from the body, and it undergoes several changes as a person ages. One of the key features of the aging process in the urinary system is a decrease in muscle tone, particularly in the bladder's detrusor muscle. This muscle is crucial for bladder contraction and effective urination. As this muscle weakens over time, it can lead to problems such as urinary incontinence, which is the involuntary leakage of urine.

Additionally, age-related changes can cause the bladder to lose elasticity, making it less able to stretch and store urine effectively. The combination of decreased muscle tone and reduced bladder capacity often contributes to the issues associated with incontinence in the elderly.

Other systems, such as the reproductive, lymphatic, and endocrine systems, do have their own age-related changes, but they are not primarily responsible for the decrease in muscle tone of the bladder and the associated urinary incontinence. This specificity is why the urinary system is the correct choice for this question.