Patel (81), who currently represents Udhna seat in Surat, had announced in April this year that he would not contest the assembly polls to make way for the younger people.
He had won the assembly polls for five consecutive terms.
However, in a volte face, Patel cited Shah's recent remarks that the BJP did not have any rule or tradition barring leaders above 75 to contest polls.
The BJP veteran said former Gujarat Chief Minister Anandiben Patel, who resigned last year, had also indicated that she was stepping down due to the age rule.
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"However, our national president Amit Shah announced in Bhopal last month that leaders who are above 75 can also fight polls. He had made it clear that there is no age bar rule. This reminded me that I am still young," Patel said.
"There is no rule or tradition in the BJP to forbid leaders to contest polls after they attain the age of 75," Shah had said in Bhopal.