atbirth=Quantity[6,"Pounds"]+Quantity[14, "Ounces"];
(((((((Quantity[7,"Pounds"]+Quantity[12, "Ounces"])/atbirth)))^((Quantity[18, "Years"])/(DateDifference[{2023,9,17},{2023,10,3}])))atbirth)/((Entity["Earth", Entity["Planet","Earth"], "Entity[\"Planet\", \"Earth\"]", "planet"])[(EntityProperty["mass", EntityProperty["Planet","Mass"], "EntityProperty[\"Planet\", \"Mass\"]"])]))