In the image, which is from a trade screen from a visiting caravan, the named pig is listed as both 13 and 14 years old. I would expect this to be the same, whether that is due to rounding up or down.
She hasn't been in cryptosleep btw. The pig has been with us from the start as tribals, and survived a heart attack.
(https://i.imgur.com/k5wgJcfl.jpg)