And besides...the word "most" is something to consider.(as in "most" don't get larger than...) Snakes grow their whole life...granted, they slow down by quite a
bit, but those of us who take really good care of our animals tend to see lifespans on the long side of what is "average".
Remember to compare where you'll be in 20 years to where the snake will be in 20 years...will that size be convenient for you then?