How old is Tantra and where does it originate from?

Answer 1

Tantra is actually part of Vajrayana/Mahayana Buddhism.
Here is a bit of history.

History of Vajrayana
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India
There are differing views as to where Vajrayana started, some claiming that it began in Udyana - the modern day Swat valley in Pakistan, while others say that it began in southern India. In the Tibetan tradition, it is claimed that the historical Shakyamuni Buddha taught tantra, but as these are 'secret' teachings outside the teacher/disciple relationship, they were written down generally long after the Buddhas other teachings, known as sutras.

The earliest texts appeared around the early 4th century. Nalanda University in northern India became a center for the development of Vajrayana theory, although it is likely that the university followed, rather than led, the early Tantric movement. India would continue as the source of leading-edge Vajrayana practices up through the 11th century.

(Vajrayana) Buddhism had mostly died out in India by the 13th century, its practices merging with Hinduism, and both tantric religions experiencing pressure from the invasion of Islamic armies. By that time, the vast majority of the practices were also made available in Tibet, where they were preserved until recently, although the Tibetan version of tantra differs from the original Indian form in many respects.

In the second half of the 20th century a sizeable number of Tibetan exiles fled the oppressive anti-religious rule of the Communist Chinese to establish Tibetan Buddhist communities in northern India, particularly around Dharamsala. They remain the primary practitioners of Tantric Buddhism in India and the entire world.

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Answer 2

Very old.. India I think..

Answer 3

dont know dont care