Can Pind Daan at Gaya be performed for ancestors who died many generations ago?

Yes. This is one of Gaya’s most important special characteristics. The Sankalp at Gaya explicitly includes all ancestors — named and unnamed, known and unknown, going back fourteen generations on both the paternal and maternal side. The Brahma Purana specifically states that even forgotten ancestors, those who died without rites, and those whose Gotra is lost, are reached by the Pind offered at Gaya. Bring whatever ancestral information you have — our Teerth Purohit will structure the Sankalp accordingly to give maximum coverage to your entire family lineage.