As you develop your retirement plan, you may notice that lots of decisions and events happen at various ages. Age 50Beginning at age 50, you can make additional "catch-up" contributions to tax-advantaged retirement accounts such as IRAs or 401(k)s each year. For 401(k) accounts in 2026, the regular limit is $24,500 -- plus an $8,000 catch-up contribution for those 50 and older. Age 62Age 62 is the earliest age at which you can collect your Social Security retirement benefits. It's very important to avoid enrolling late, as there's a hefty penalty you'll be charged for the rest of your life.