E.g., domesticated dogs and cats now live much longer with better care, including better veterinary care—but they don’t have a need to extend their kittenhood or puppydom for twice as long.
I believe the intellectual stimulation to which this writer refers has been shown to be important for health right up through old age. If his anti-marriage and anti-settling down argument holds for youth, presumably it would hold throughout our lifespan.
Cats and dogs don’t have the pressure of paying taxes, holding a job, supporting a family. I don’t buy your analogy at all as valid.
And in fact, I do have an analogy with cats and dogs that prove my point: inside cats and inside dogs far outlive outside cats and dogs measured species to species.......