How much should you have saved for retirement?

When I was in my 20s, I was lucky to work for a company that offered a pension plan—and that put me on the road to retirement. Today, unfortunately, company pensions are rare. How can you ensure a comfortable retirement? Try shooting for these age-related milestones:

Age 25. Start saving at least 15% of your gross income. As I mentioned in an earlier article, a Fidelity Investments study found that if you save 15% of your gross income every year from age 25 through 67, and you also receive Social Security, that should ensure…