"I do not agree with this 75-year age bar for appointment of a person as minister," Sinha, second term BJP Lok Sabha MP from Patna Sahib, told PTI.
67-year-old Sinha, who served as Union minister in the NDA government of Atal Bihari Vajpayee, disputed fixing such an age bar.
"Instead of age, the criteria shall be mental alertness and health," he said.
"Even at an age of 86, veteran BJP leader L K Advani has a sharp memory and energy like a 40-year-old man," said Sinha, who has on numerous occasion described Advani as his "political guru".
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"There are people who are dull and lethargic at a young age of 50," Sinha who has been BJP's star campaigner for long said in support of his argument.
The "Bihari Babu" said it was a well known fact that for an average person the political career starts at 50.
"To curtail the political career at the age of 75 means one has only a span of 25 year in politics," he said.
Ravishankar Prasad, Radha Mohan Singh, Ram Vilas Paswan and Upendra Kushwaha from Bihar found place in the new Cabinet sworn in on May 26.