Soon after birth. Tom was sent to a muggle orphanage where havoc erupted as he grew older. Tom had no idea he was a wizard and had no control over his magic but used it to torture the kids there. That was until the day Albus Dumbledore arrived at the orphanage to inform Tom of his blood and offer him a place where he can learn to control his magic and a place to fit in, a place called Hogwarts. The Answer of course was yes.

So Tom boarded the gleaming scarlet steam engine Hogwarts express on Platform 9 and 3/4 where ahead his magical life begins and so does our story; the deeper story of Lord Voldemort.