It totally depends on if you're getting a male or female. Females typically are a lot bigger.
My adult males are something like 1200g and 1000g, and they're about 2" thick. They're 2 years and 1.5 years old. My female 2000g is maybe 3 inches, and 5 years old. But they can fit into smaller holes than themselves.
eta: not sure why that angry smiley appeared LOL