Gibson = Normal
Golem = Italics

Maybe the lack of aging is because the mushroom kingdom is situated snugly against our own universe. Nobody said the universe was certainly infinite-in fact , it's thought that the supposed Big Bang occurred when two universes , contained within a membrane of space-time , collided with one another , and caused ours to form. May sound like Star Wars , or Star Trek techno-babble , but trust me , it's not-this theory is being introduced into the scientific community with growing acceptance. The universe containing the Mushroom kingdom does not , in many ways , coincide with our basic laws of phsyics-remember , our laws of physics are not multi-versal (applying to more than one universe). That means , sequences of time changes , the continuum may be reverse in operation-or the planet of the mushroom kingdom (obviously in SMB:Movie , the mushroom kingdom was on a planet) may have some regenerative ability-perhaps something in the air or something it's sun emits. About the unique human qualities to the supposed animals there-Bowser prolly doesn't have a degree in biology and the manipulation of deoxyribonucleic acids , but that doesn't mean his minions don't. They could be geneticists that are human working for Bowser-Heck , Bowser could be a spinoff from one of their creations. Just imagine-on a neigbhoring planet , the humans could have been working on an expierement to revolutionize the intelligence of reptiles. WHAM! That's done , so they continue on to strength , size, agility , and soon it spirals out of control , and bowser is born. Not just bowser , but a mate-perhaps a Mrs. Bowser. they continue on , reproducing Lemmy , Larry , Ludwig and the others-the genetecists fall under his control , and continue to crank out Koopas and the others that inhabit the Mushroom Kingdom. That would explain Bowser's origins. Now , Boswer decides to conquer some planets-yahoo , he's excited because there's this puny little planet just a few million galactic blocks away. So he hops into his little spaceship , or starship , or pod-whatever u'd like to call it-and takes his scientists with him. First , though , he sends all the necessary equipment so they can create more monsters of destruction. Then comes the populations-Bowser's minions. They create more and more evil creatures with low brain capacity. Soon , they develop a way to cause an organism's cells to revert back to primitive stages in their evolution-so he captures some people indigenous to the mushroom kingdom and he has more. This isn't so alien-Koopa in SMB:the movie , was able to change toad into a goomba. All this takes place in a bubble of space-time fabric billions of times larger than our known and documented space-where the laws of physics are different from our own. And aging isn't a problem.
-Matthew Ryan Gibson

If you didn't get that universe thing the first time through, here's a more in-depth explanation:
Well-some scientists believe that the universe wasn't a big-bang , it was rather a big splat. According to current evidence , there is a membrane of some sort surrounding our universe-we're basically just an envelope full of mass and empty space. There is also a neighbhoring universe with a membrane much like ours. Once every few quintillion years (much more than a billion) These two collide , pull apart and form a new membrane or envelope of matter and empty space, only different. NOthing said that any neighborhing universes had to confide within our concepts of physics and the four phases of matter-liquid , solid , gas , and plasma. So , this new universe was essentially created when our universe and neighborhing universe pulled apart. We're talking scales so massive that it's near infinite. Not one equation can be written to even begin to describe this massive a scale. -Gibson

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