Bhartiya Sakshya Adhiniyam provides for Presumption as to documents________ years old.

S. 92. Presumption as to document thirty years old. Where any document, purporting or proved to be thirty years old, is produced from any custody which the Court in the particular case considers proper, the Court may presume that the signature and every other part of such document, which purports to be in the handwriting of any particular person, is in that person's handwriting, and, in the case of a document executed or attested, that it was duly executed and attested by the persons by whom it purports to be executed and attested.