If crocodiles are k-selected, why do they supposedly "not age," as in avoid senescence?

Question

I recently saw a few sources stating that Crocodiles do not biologically age, implying negligible senescence. Basically, a 70 year old crocodile is in the same physical/health condition as a 7 year old crocodile. However, crocodiles are K-selected, meaning that populations are generally close to their carrying capacity. If they do not exhibit natural senescence, isn't that evolutionarily disadvantageous, because the younger crocodiles with more slightly more fit genes will not necessarily replace the older generations, meaning that crocodile populations would adapt to environmental changes significantly slowly. Can someone please explain to me how this lack of senescence can apply for this type of species?

Answer 1

Crocodiles absolutely do experience age-related senescence. If they didn't, wouldn't a well-fed crocodile at a well-maintained zoo live forever? After a certain age, they slow down and lose body condition.

On the other hand, there's the decidedly r-selected reproductive strategy of the lobster, a species that truly doesn't appear to exhibit senescence, and simply gets too large to molt after a certain age.