Dear Arun,
Your PF account will remain active forever until you withdraw it; it is your property. You may have seen the advertisement on TV that from 1st April 2011, if there are no transactions in your PF account, you are not eligible to receive any further interest on it.
The reason it stays active forever is in case a candidate is jobless and really needs money during this period, is searching for a new job, or is unable to find a job, resulting in no transactions in the PF account. The government does not penalize the candidate by deactivating their PF account.
Best Regards,
Global Overseas - Delhi office
Mohammad Sajid Ansari
+91-9899775578