What to do with my PPF account, completed 20 years with it?

[Aansh]

I have completed 20 years of my PPF account (20=15+5; with one extension of 5 years). Now I still want to continue investing in PPF. Please suggest if –
1- Can I extend my old PPF account to another 5 years?
2- Or do I need to close my existing PPF account and open another PPF account for 15 years?

3- Am I eligible to open another PPF account (after closer of first one)?

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