Lesson 6: Why delay is the most expensive decision most investors never notice.Start at 25, or wait until 35?Two people invest the same $300 a month until age 65. One starts at 25, the other at 35. How far apart do they finish?ANot farThe late starter only misses ten years of contributions.BRoughly double for the early starter.CBarely apartBoth keep paying in until 65.