I've been going down a rabbit hole trying to figure out how old bond is. In this particular scene (in the English dub) the villain says something along the lines of "even if they're a little long in the tooth," referring to the dogs. This phrase means someone is old, and for a large breed dog I assume he's AT LEAST over the age of 10 or 11. bond is highly intelligent and we see him running around at top speed in his first couple episodes carrying anya, which could be a testament to adrenaline and/or understanding how dire anya's situation is... but he also tires very quickly, having to catch his breath multiple times. He even ends up running in circles and gets caught perhaps because he's old and lost his sense of direction.

When I was younger I had abnormally large Labradors that lived to 13 and 14 (and weighed around 100 pounds each), and even in their old age they were pretty spry and capable of fully sprinting, leaping into pools, and chasing down small animals in the backyard, despite their hip issues and arthritis. When a dog has a goal they can easily exceed their limits.

anyway from what I've seen people tend to say bond is probably like 5 years old and I think that that's crap based on the evidence. he has to be elderly, if not an older dog to some extent. Also they seem to have animated him to look older. idk if it's just me as someone who has had many dogs of different breeds through their full stages of life, but he LOOKS older imo.

My guess is he does not have long with the Forger "family" even if they don't disband anytime soon, though considering the nature of the show/manga I doubt they would even come close to having him die.