Mr.K.Ganeshan, Yes.you can continue your PPF A/c even after 15 years.Ask the Bank,with which you have your PPF A/c, to extend it for 5 years.The Bank will put a stamp of 5 year's extension on the passbook.You can repeat your request every 5 years till you wish;... or till Govt.closes the scheme,which is very likely to come sooner than later.