Since you have developed renal stones
at an early age it is important to find out whether you have any metabolic defect. once you have ruled that out then you should follow some simple do's and dont's to prevent recurrence.
do's 1. plenty of water 2.regular exercise 3. avoid obesity
dont's 1. avoid excess of tea. 2. avoid excessive ingestion of of tomatoes and spinach
3. avoid ingesting excess of calcium products.
periodically get an USG of the kidney
and bladder done.