It's circular. Sure it's pegged to metal, but won't tell you how much corn or land or homes you can buy with it. What should one oz of gold, hoarded in 2025, be able to buy you in 2050? Many factors will determine that. Theres no such thing as fixed value, unless the definition is self referential.

The only thing to do is turn present day savings in capital, it's the only claim one can have on wealth in the future.