Ok, I know that some snakes will grow faster than others and all that, BUT does anyone have a general age to weight norm?

I have a male normal that I got as a baby in February and he weighs 594g as of today and that's with him missing his meal last Friday. I'm seeing ads on KS for '08's that weigh under 500g. Does this mean my guy is a fatty? He's only missed 3 meals since I've had him and he eats appropriately sized food every Friday. He's already eating big smalls or smallish medium rats.