Koala, 30 million years
For 30 million years koalas have been walking the Earth. They have been alive since Australia was already separated as a continent, which means that, most likely, koalas only lived there. During these years, it’s assumed that there have been different species of koalas.
You are right Amos, everything was created in 7 days by a magic man in the sky.
Carbon dating is not relevant here since it only can date thing that are 50000 years or younger. There are other methods for older things. The theory of evolution makes sense and can explain a lot of the observations that have been done by scientists.