We don't know every species that has lived. Finding new species doesn't discredit evolution, it adds to our knowledge of evolution.
Technically you evolved from a infant to a adult. That's basically what evolution is, change over time, but more technically change on a species level. You can say age but its basically evolving.
The big difference is species change over time(millions of years). For example at one time there was one feline lineage species ,,,evolution stepped in...then there are many such a lion, tHiiger, cheetah, leopard, down to the little house cats we know today.