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Proper care for animals increases their life expectancy a lot as well. The difference in life expectancy between (domestic) cats being cared for by humans and living in the wild is huge: 15-20 years vs. 1.5-4.2 years.

German source, because English WP lacks this information - just use a translation tool of your choice: https://de.wikipedia.org/wiki/Hauskatze#Lebenserwartung

Yet cats are self cleaning in both cases, with the SPCA saying that cats should not usually be bathed [1]. This longevity is most likely related to diet, and not being eaten by predators.

[1] https://www.ccspca.com/blog-spca/education/bathing-a-cat/

This was not meant to be a direct reply to the cleaning method.

I meant to give an example that showed that the life span of animals can easily be extended to multiple times of it just by not doing things as nature does them.

Are you sure it's different? Or do we just have a much lower tolerance for spreading disease than most animals.

And wild animals die of small infections and deal with parasites all the time. Success is just being able to live long enough to reproduce. Being able to clean ourselves improved our health a lot.