My uncle (76 years old) has cerebral palsy and is in hospice for kidney disease since dec. 2021. he is not on dialysis, can i get an estimate for his life expectancy?

We would have to have some data such as eGFR,BUN,creatinine, electrolytes, presence of anemia or diabetes. Surprisingly most deaths from CKD occur before end stage disease. Cardiac causes from high serum potassium, myocardial infarction,congestive heart failure and cancer are some common causes. I wouldn't be able to estimate your uncle's life expectancy without more information.

I assumed your uncle has nonoliguric (decent urine output) chronic kidney disease and that explains he has survived last 6 months. Without dialysis, patient with end stage kidney disease can survive up to 2 years but most succumb after 12 months, especially patient with significant morbidity. So I predict less than 50% he will survive til 2023.