OOP in Lua - Creating a class?

I'm aware there are a few questions about implementing OOP in Lua on this site, however, this one is a bit different (at least compared to what I found).

I'm trying to create a class called "human", and make it so objects created with the "new" constructor of "human", inherit everything inside human except it's constructor. However, I also don't want to be able to use methods inside of human, on human. So whatever's inside the human class, is only passed to created objects. Here's an example:

-- "Human" class
human = {}

function human.new(name)
    local new = {} -- New object

    -- Metatable associated with the new object
    local newMeta = 
    {
        __index = function(t, k)
            local v = human[k] -- Get the value from human
            print("Key: ", k)
            if type(v) == "function" then -- Takes care of methods
                return function(_, ...) 
                    return v(new, ...) 
                end
            else
                return v -- Otherwise return the value as it is
            end
        end
    }

    -- Defaults
    new.Name = name
    new.Age = 1

    return setmetatable(new, newMeta)
end

-- Methods
function human:printName()
    print(self.Name)
end

function human:setAge(new)
    self.Age = new
end

-- Create new human called "bob"
-- This works as expected
local bob = human.new("Bob")
print(bob.Name) -- prints 'Bob'
bob:printName() -- prints 'Bob'
bob:setAge(10) -- sets the age to 10
print(bob.Age) -- prints '10'

-- But I don't want something like this allowed:
local other = bob.new("Mike") -- I don't want the constructor passed

-- I'd also like to prevent this from being allowed, for "human" is a class, not an object.
human:printName()

So creating the object with human.new("Bob") works fine, but it also passes the constructor, and I can still use the object methods on the class. I'm very new to the concept of OOP, so I'm sorry if this was a horrible question. But if anyone could help, I'd appreciate that.