Under Article 243 F (1) (a), it is mentioned that the minimum age to contest an election as a member of Panchayat is 21 years while Article 84 (b) of the Constitution of India provides that the minimum age for becoming a candidate for Lok Sabha election shall be 25 years. 

The minimum age for the registration as a voter is 18 years. 

 

So, the correct answer will be 21 years.