Thanks for your query,based on the facts that you have posted it appears that you have passed pieces of tissue in your urine .This is nothing but shedding off of epithelial lining of bladder mucosa.This could be due to Cystitis secondary to Enlarged Prostate
Please consult qualified Urologist
to clinical and digital rectal examination
to rule out enlarged prostate which is very common at this age,
Please get following basic tests to confirm the diagnosis.
1)Routine Urine test and urine culture.
scanning of abdomen to rule out enlarged prostate,
Further treatment will depend upon final diagnosis .