Traditionally, the average lifespan of a Nepali used to be 40-45. Child mortality rate was high, and very few people lived to a ripe old age.
Which meant that living long was a cause for celebration in the family, clan and community. People in Kathmandu Valley’s Newa community celebrate ‘Janko’ or ‘Buda Pasni’ at milestones of 77, 82, 88, 99 and 105 years.
Look at it like a birthday, but is performed every decade or so after a person crosses 77. In case of couples, the Janko is performed according to the husband’s age. For a single person, the date of birth and birth charts are consulted.