There's been 30 years of compulsory superannuation now, even on a low wage and not contributing extra, that is a lot of compounding.
That's a very rough average based on someone earning $20k pa for the past 30 years, what's the minimum wage, averaged over the past 30 years? It's now $42k pa
In the early to mid 1990s i started working in a kitchen while in high school, i was earning $6/hour which is more than $20k a year