Just now found out the probable reason why TN govt would have made Thiruvalluvar age so early. "An attempt was made to introduce a Valluvar era beginning with January,30 B.C. The two important scholars claiming early age for TK were S.Somasundara Barathiyar, Tiruvalluvar,pp. 5-18; and M.Rajamanickam, Tamil moli ilakkiya varalaru,pp. 118-23." Foot notes pp.124 Tamil Literature(1975 ed.) - Kamil Zvelebil.