In a letter to the Chief Election Commissioner, senior BJP leaders alleged that Abdullah is below 25 years of age and attached proofs to substantiate their claim.
Abdullah is contesting UP assembly polls from Swar seat in Rampur district on Samajwadi Party ticket.
The letter, signed by UP BJP vice-president JPS Rathore and general secretary Vijay Bahadur Pathak among others, also said the returning officer appeared to be "biased" as he "glossed over several shortcomings" in Abdullah's nomination papers and demanded appropriate action against him.