How long an elderly person can live without urine depends on the specific cause of the anuria. The first one is urinary obstruction, such as prostatic hyperplasia or ureteral stones, which can cause anuria in the elderly, but as long as the obstruction is removed through surgery in time, urine can flow out and it will not affect the life expectancy of the patient. Secondly, if the anuria is caused by acute renal failure, if the cause of the acute renal failure is clarified in time and treated actively, the patient’s life expectancy will be greatly extended or even not affected. Thirdly, if the anuria is caused by chronic renal failure in the uremic phase, at this time, if not treated in time, the patient may die in a short period of time, and some patients may even die within a month. However, if patients undergo dialysis treatment can extend their life span and be able to maintain it within about ten years.