def _get_color(self, age):
if age == self.tree.age:<EOL><INDENT>return self.leaf_color<EOL><DEDENT>color = self.stem_color<EOL>tree = self.tree<EOL>if len(color) == <NUM_LIT:3>:<EOL><INDENT>return color<EOL><DEDENT>diff = [color[i+<NUM_LIT:3>]-color[i] for i in range(<NUM_LIT:3>)]<EOL>per_age = [diff[i]/(tree.age-<NUM_LIT:1>) for i in range(<NUM_LIT:3>)]<EOL>return tuple([int(color[i]+per_age[i]*age) for i in range(<NUM_LIT:3>)])<EOL>
Get the fill color depending on age.

        Args:
            age (int): The age of the branch/es

        Returns:
            tuple: (r, g, b)