I'm in my late 60s now, so this study is intriguing.

Back in 2020, when my whole world shut down to just our house, we ended up with two rescue kittens (one just showed up on our porch, the other was starving in the alley behind our house). They were such a bright light during that time, which was stressful even for me, a confirmed misanthrope.

Those two kittens brought the total count to 6 cats (plus a dog), which is a stressor of another kind, but the constant interaction with other sentients beings is exercise in staying cogent and physically active.