If you can alter the future it might make sense. Say I tell you to invest in whatever comes after NPTs. Maybe your investment will alter the course of what happened. However I seriously doubt that 10% of your income in an index fund will alter much. Also, there is a problem with getting money too early. You go back and give young you lottery numbers, they make bank and die of an O.D. a decade later.
If you can alter the future it might make sense. Say I tell you to invest in whatever comes after NPTs. Maybe your investment will alter the course of what happened. However I seriously doubt that 10% of your income in an index fund will alter much. Also, there is a problem with getting money too early. You go back and give young you lottery numbers, they make bank and die of an O.D. a decade later.