Question
At what age was Lord Krishna killed by the hunter?
Answer
Krishna lived for 125 years; in the Srimad Bhagavatam, Brahma tells Krishna that it's time for his life on earth to end:
O Supreme Personality of Godhead, O my Lord, You have descended into the Yadu dynasty, and thus You have spent one hundred twenty-five autumns with Your devotees.
There's another popular way to calculate his age: the Matsya Purana apparently contains a reference to Krishna being 89 years old during the Mahabharata War (see here), and the Mausala Parva of the Mahabharata says that Krishna died 36 years after the war, which adds up to 125 years total.
Note: “The question: At what age was Lord Krishna killed by the hunter?” is licensed by Stack Exchange Inc (https://hinduism.stackexchange.com/); user contributions licensed under CC BY-SA.