A little further down it shows graphs of a "typical investing timeline" from around age 20 to age 60. It still looks pretty solid.
You have to make some really poor decisions about where you live to be spending every dollar on rent and student loans assuming you have a job that does not pay minimum wage.
Making investing a priority can be hard, but it is far from impossible at that age. Even a small amount early on will far out weigh a much larger amount invested later. It is important to communicate that instead of telling people they probably can't do it.