The luster of an experience can actually go up with time. So, learning to play a new instrument, learning a new language - those sorts of things will pay dividends for years or decades to come.
I think investing in a good education has been key for me, although the investment was more in time than money.
The best investment you can make, is an investment in yourself... The more you learn, the more you'll earn.
Early childhood education packs a real wallop in terms of the return on the investment.
The prudent course is to make an investment in learning, testing and understanding, determine how the new concepts compare to how you now operate and thoughtfully determine how they apply to what you want to achieve in the future.
There's life for you. Spend the best years of your life studying penmanship and rhetoric and syntax and Beowulf and George Eliot, and then somebody steals your pencil.