This answer claims that, Vālmīki, the author of Rāmāyaṇa, is still alive:
Valmiki is still living. He was also present during the conversation between Yudhishthira and Bhishma which is recorded in Anushasana Parva of Mahabharata.
If Vālmīki's alive, I wish to know where is he right now. I mean where is he physically present?
If he wasn't alive at the time of Mahābhārata, is it possible that the Mahābhārata is talking about a different Vālmīki or are those lines from Anuṣāsana-parva of Mahābhārata a later interpolation (i.e., not part of the original text)?