the relative young of a stone is the reptile of space passed since a stone was formed
ancient_greek is greek. ancient_building_material is stone. cerastes is reptile. metamorphic_rock is stone. stone is stone. astrology has roots_in_prehistoric_times lizards has sex_to_produce_offspring skyros_wall_lizard is reptile. geochelone is reptile. geochelone is reptile_genus.