I have a mate the same, He retired this year at 32 after 10 years of work as a mining engineer in a gold mine, at first he was in Kalgoolie then he was in Mauritania, worked 3 weeks got 2 weeks off where they would fly him to wherever he wanted and was on 500k a year for his troubles. He has been more or less everywhere in the world and owns 6 houses outright in Perth and Kalgoolie. He is pretty much just living off rental income for as long as he likes.