Aldabra giant tortoise
Large tortoises are among the longest-lived animals. Some individual Aldabra giant tortoises are thought to be over 200 years of age, but this is difficult to verify because they tend to outlive their human observers. Adwaita was reputedly one of four brought by British seamen from the Seychelles Islands as gifts to Robert Clive of the British East India Company in the 18th century, and came to Calcutta Zoo in 1875. At his death in March 2006 at the Kolkata (formerly Calcutta) Zoo in India, Adwaita is reputed to have reached the longest ever measured lifespan of 255 years (birth year 1750). Today, Jonathan, a Seychelles giant tortoise ("A. g. hololissa"), is thought to be the oldest living giant tortoise at the age of years and Esmeralda is second at the age of years, since the death of Harriet at 176, a Galapagos giant tortoise. Esmeralda is an Aldabra giant tortoise.
Granny (orca)
Now that orca studies have been conducted for several decades, the exact age of many younger whales is known. The age of older orcas, such as Granny, is estimated by their offspring; they give birth around age 15, and stop having offspring around 40; by adding the generations together, ages can be estimated. Granny was photographed in 1971 with a male orca, J1 Ruffles, who was believed at the time to be her son. Ruffles was estimated as at least 20 years old, and as scientists believed him to be Granny's last offspring, her own age was estimated at about 60. It was later discovered that Ruffles was not Granny's son, but her age estimate was never changed. Granny's age was originally estimated with a margin of error of 12 years, but was the subject of an academic dispute in 2016 due to her original age being based on evidence now known to be incorrect, as well as a large disparity between the life expectancy of orcas with estimated ages and orcas with known ages. Analysis of fatty acids from a recent biopsy of Granny indicated that Granny may have only been 65–80 years of age.