Nobody has been able to collect any of Max’s DNA because he has the ability to manipulate it to suit his own dastardly needs. As a result his age is unknown to everyone except himself.
Max is a bitter twisted megalomaniacal (we think it means a psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence and or an obsession with grandiose or extravagant things or actions...ha ha) mutant half man half rabbit species from a far off planet in the same solar system as Frog. Back on his home planet an alien strain of the Myxomatosis virus wiped out most of the population of his world and now Max is on a mission to replenish it using animals and plants from ours.
As he is totally fascinated by animal genetics he is also a collector of endangered species. If they aren’t endangered, he will soon make them so.
He can jump very high and can telepathically control animals to do his bidding. Consequently he is a fearsome adversary, especially for Frog. Catchphrase "Hee hee hee there can only be 1". He hates being called a Rodent. Rabbits are in fact not rodents but belong to their own order called lagomorphs. The evolutionary split between rabbits and other living mammals on earth probably occurred about thirty million years ago.