Which renal change is commonly associated with aging?

The option regarding the increased frequency of urination is aligned with the physiological changes that occur in the renal system as individuals age. As people grow older, several factors can contribute to more frequent urination, including reduced bladder elasticity and changes in hormonal regulation. The aging process often leads to a decline in bladder capacity, which means that the bladder may fill more quickly and signal the need to urinate more often.

Additionally, aging can also impact kidney function, potentially leading to changes in the body's ability to concentrate urine. However, the increase in urinary frequency is a more evident and consistently reported aspect of the aging renal system.

Regarding the other options, decreased urine output is not typically associated with aging, as many elderly individuals will still produce a normal urine volume. Increased risk of bladder infections can be a concern in older adults, but it is not as universally predominant as the increase in urination frequency. The ability to concentrate urine might decline but again, the increase in the frequency of trips to the bathroom is more commonly noted among the elderly population, making it the correct response in this context.