The woman, a native of neighbouring Andhra Pradesh, was stopped near 'Pathinettam Padi', the sacred 18 steps leading to the temple complex, and sent back, police said.
As per the temple tradition, entry of women in the 10-50 age group is restricted in the shrine dedicated to Lord Ayyappa, who is considered a 'Naishtika Brahmachari' (perennial celibate).
The woman was stopped and sent back after it was found that she was only 31-years-old as per her identity card, police said.
He did not divulge further details.
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Temple sources said the woman had come along with her family members.
Entry of women is strictly monitored by police at Pampa river before they begin to trek Sabarimala to reach the shrine.
Temple sources were clueless on how the woman managed to reach near the shrine, defying police monitoring and stringent checks.
Marking the beginning of the pilgrimage season, the Sabarimala Temple opened on November 15 for the three-month annual 'Mandalam-Makaravilakku' festival.
The restricted entry of women in the famed temple has been challenged in the Supreme Court, which had on October 13 referred the matter to a constitution bench.
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