Tony Gutierrez, Associated Press
Jenny, recognized as the world's oldest living gorilla in captivity, celebrates her 55th birthday Thursday with a four-layer frozen fruit cake and banana-leaf wrapped treats at the Dallas Zoo. Her caretakers say she's having a few joint issues and her eyesight isn't what it used to be, but she still looks good for her old age. Gorillas in the wild normally live to age 30 or 35. Heath care and protection have extended the animals' life span in zoos.

Jenny, recognized as the world's oldest living gorilla in captivity, celebrates her 55th birthday Thursday with a four-layer frozen fruit cake and banana-leaf wrapped treats at the Dallas Zoo. Her caretakers say she's having a few joint issues and her eyesight isn't what it used to be, but she still looks good for her old age. Gorillas in the wild normally live to age 30 or 35. Heath care and protection have extended the animals' life span in zoos.