Nobody knows. In one temple in Lothal, near a city uncovered by archeologists and supposed to be 5,000 years old, in which the deity "Vaniar Devi" is still worshiped may be the oldest. Lothal was a sea-port and "Vaniar Devi" is related with trade. Similarly, temples in Kurukshetra, and crematoriums in Delhi (Nigambodha Ghat) and Varanasi (Dashashwamedha Ghat) are very old and may date from Mahabharata time.
Ettumanoor temple (17 kms from Kottayam) or the Vaikkom temple, is the oldest temple in kerala.
(note: am not much sure. Pleas ensure with a Google search).
It is thought to be in Arunachal Pradesh, Northeast India. The White Horse Temple is the oldest Buddhist temple recorded. It was established by Emperor Ming. It was built in the year 68. White Horse Temple is one of the oldest recorded temples. Buddhism originated in Northeast India, so the temple there is probably older.
Swami saranam
Sri Rangam The Mundeshwari Temple is claimed to be the oldest functional temple in India. From its stone inscriptions it is evident that the temple was present in 108 AD. Mundeshwari temple in Kaimur district of Bihar. : The Oldest Hindu Temple is the Gudimallam Shiva Temple near the Tirupati Lord Venkateswara Temple and is located in Gudimallam, a small village situated in Kalahasti Taluk, of the Chittoor district of Andhra Pradesh, India. : The main importance of the temple lies in the Linga which is housed in the Garbhagriha of the temple. This is supposed to be the earliest Linga discovered so far and it has been assigned to the 2nd or 1st century B.C
Of the most ancient Indian city is Vrindavan where Lord Krishna used to take his cows for grazing with his Gwal friends. Means Treta Yug.
Aryavarta is the oldest name of India.
Kutch dargah is India's oldest
Aravalli is the oldest mountain in India.
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Srirangam Temple
somnath temple
the link has what you are looking for.
The largest temple is the SriRanganathasamy Temple in Srirangam, Trichy. It covers 156 acres and is the largest temple in India and the world's largest functioning temple.