Tsé Guk
Tsé Guk (Wyl. tshe ‘gugs), 'The Summoning of Longevity', is a Vajrayana practice for repairing, restoring and reclaiming the life force, hence increasing life-span.
Certain deities are particularly associated with longevity, the most well-known being Amitayus, White Tara, and Ushnishavijaya, who are referred to as the three deities of long life.