In human beings, males are more diverse than female with respect to many attributes. Just look at height: it is common that, in a classroom, both the shortest and tallest individual are boys. In chimpanzees, researchers report that males have greater brain structure diversity.
Scientists have created “healing patches” for hearts. They greatly accelerate heart repair following a heart attack, in mice and pigs. It is made out of heart pig tissue, with the pig cells removed. The patches are believed to be safe, they can be frozen for later use.
It is commonly believed that evolution made us as fit as possible. In this model, aging is the inevitable result of entropy. I do not believe this entropic model. In simulations, researchers have shown that a population of worms might be fitter if its individuals age and die. This should not surprise us: annual plants have evolved out of perennial plants. Your garden flowers can often be easily be kept alive indefinitely even though they are annuals. Your plants age and die on schedule because it is advantageous for the species. Animals of a similar size have frequently vastly different lifespans… naked mole rats are rats that are not subject to Gompertz curves (they are effectively ageless).