Draws the tree.

        Args:
            ages (array): Contains the ages you want to draw.

def draw(self):
        """Draws the tree.

        Args:
            ages (array): Contains the ages you want to draw.
        """
        for age, level in enumerate(self.tree.get_branches()):
            if age in self.ages:
                thickness = self._get_thickness(age)
                color = self._get_color(age)
                for branch in level:
                    self._draw_branch(branch, color, thickness, age)