Thanks, an interesting chart. One unfortunate result of the portrayal is that it invites users to "trace the line" of, say, a "30 percentile worker" through his lifetime, and I don't think that's an especially accurate portrayal of economic life in the US. People rise and fall through the "percentiles" according to their talents, effort, luck, etc. I know that my high school friends who went to work instead going to college as I did were way ahead of me on the income scale for at least 4-5 years, but stats would indicate they we swapped places at some point. But some of those people started successful businesses and will always be ahead of me. So, all of us were "hopping lines" up and down throughout this period, and I think that happens quite a lot throughout the lives of many people.
So, good chart, but we need something else if we want to understand income "mobility" in the US and the complexities of how the incomes of real people varies with age.