跟之前的温度换算项目类似，这里曾经犯错的地方是：
console.log(earlyYears); 错误1: 打错单词成了consolo 错误2: 多加了双引号在earlyYears。
// my current age
const myAge = 29;
// early years
let earlyYears = 2;
earlyYears *= 10.5;
let laterYears = myAge - 2;
// calculate the number of dog years accounted for by your later years.
laterYears *= 4;
console.log(earlyYears);
console.log(laterYears);
// Add earlyYears and laterYears together
let myAgeInDogYears = earlyYears + laterYears;
let myName = "Alex".toLowerCase();
// print dog's age
console.log( My name is ${myName}. I am ${myAge} years old in human years which is ${myAgeInDogYears} years old in dog years. )
