Frugalists want to retire at 40 – “What planet do these people live on?”. “I simply spend less money than I earn in my job and save the difference,” says Oliver Noelting on his website frugalisten.de.

Frugalism is equally suitable for low earners and high earners, says Florian Wagner. If you want to retired at 40, you have to plan it well, says the frugalist.