Did he say why it would be hard for you to ride? Remember that he's motivated to sell you an alternative, so you need to be suspicious of his statements. Especially if he's not backing them up with specifics.
So, is it too long? Is it for the wrong type of riding? Is it to advanced a board for you? What's the deal?
I told my kids, "Someday, you'll have kids of your own." One of them said, "So will you."
-- Rodney Dangerfield.