Investing money for retirement can be daunting, especially since it’s common for future retirees to worry about whether or not they’ll have enough money to last them through their golden years. There are a few rules of thumb out there aimed at helping you figure out where stage you’re at in the retirement savings. One analysis found that you should have at least your annual salary saved up by age 30 to be on track to retire by age 67. And by age 40, you should have three times your annual salary saved. Another strategy uses the 4{9f99fe44fce1aa3c813d0a0ce4da2fbea8a5a58e9d85c4a2927dd8140cb676b5} rule to help individuals calculate their retirement number — you’d just multiply…