Dear Shyam, there is no upper age limit for appearing for NEET PG. You haven't mentioned your highest qualification. But for being eligible for NEET PG, you should have completed your MBBS along with 1 year mandatory rotational internship. You can check the complete eligibility criteria here: https://medicine.careers360.com/articles/neet-pg-eligibility-criteria

Now regarding PCPNDT, if you are a registered practitioner, you can undertake this 6 months training. So, if you fulfil the NEET PG eligibility criteria, you can appear for NEET PG and your age shall not be any hindrance.