Our culture can be so annoying, where people over 28 consider themselves ''old''. 30 is ''old''. Or 40, which is supposedly ancient.
I think it's ridiculous. Your brain stops maturing at 25, and just a few years after that, into adulthood, you're old?
With pets/animals, I don't consider them old until they actually get old, show signs of advanced ageing so to say. My cat is 9, I don't consider him old because he's still got many years left and he's healthy and active. Honestly, I consider animals (and people) to be old, perhaps, when they're in like the last 20, 25% of their life. And not even always then. I mention animals because of the lack of cultural connotations around age.
I just had to put it out there. I find the self-deprecating jokes sad, when people are over 30.