Riddle 7

Riddle by @chessmaster17402:

In the first year of my life, I walk on 4 legs. then something happens and I walk on 2 legs for 70 years. after 70 years I grow another leg and walk on 3 legs. How is this possible and who am I?

3 trophies

I don't really know who you are, just please stop growing legs. It's really starting to freak us all out.

your evolution?

or eraniel1 

human 

XD kittenlord

No Enya

Is IG

I got nicknames for you two XD

Just wondering, whats the reasoning

oh ok,

but humans dont live for 140 years

70 years on two legs, and another 70 for 3

but the longest living human lived 122 i think

Whatever...

IG, you can message me a riddle idea if you want

Ok