Indeed.

It's well said that they rarely make old bones.

When young and silly, they get run over.
When adult, they take on things to large - or in the case of snakes, too lethal - for them.

If they survive to age, deafness, and the slowing that come with arthritis, they get run over.

That said, my first JRT is dying of cancer. She's has two bouts of surgery, and I've concluded that further efforts wouyld be a waste of effort. She's slowed, but while she still enjoys her tucker and is capable of enjoying life, I'll wait.