My relative passed away many years ago or Can I still bring their ashes for immersion in Varanasi?

Yes, absolutely. The grace of Kashi and Ganga Maiya is timeless. Even if the death occurred long ago and the ashes were kept safe, performing Asthi Visarjan here now will still bestow immense peace upon the departed soul and bring closure and blessings to the family. The merit is not diminished by the passage of time when the act is performed with sincere faith in this holy city