Grandview's walruses were said to be two years old in January of 2016.
Construction on the Grandview Aquarium began in 2015, with the facility opening to the public on January 16th, 2016.
I can only confirm two cows as currently being housed at this facility. Early unofficial reports around the time of the aquarium's opening stated five animals, though I have only ever visually confirmed a maximum of four.
2016-Jan-20. 羊城晚报。传说受到伤害你还好吗？Retrieved from inews.ifeng.com.