Because Betta's don't live very long...usually 3 yrs max ..and that one looks full grown to me.
I like buying from seller's who disclose the truth to me, not ones who skip around the truth. If the fish is older...why are they not saying that...it just makes me wonder if something is up.
It's like me going to a gas station and I think I am buying Chevron gas, but it turns out they were out and they subsituted Shell brand instead. I just like to know what I am getting lol.
I think I found another fish I like better anyways.