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> 2% returns actually doubles your money every 10 years

I wish! More like 35 years.

7% returns will double initial investment every 10 years.

That said tho if you invest even $200 a month from the age of 20 till retirement you will have more than 1M by retirement with a decent index fund.

That said, one million dollars ain't what it used to be after 45 years...

Index funds tend to scale rather well with inflation tho.

7.2%