Gold is not suitable for our retirement investment goal.  Gold is a part of an asset class called 'Precious Metal', but it is not an income generating asset.  Investing in gold is a speculative play to wait for its appreciation, not like investment in real estate, bond or dividend paying stock which will produce income for your retirement needs.

If you are a high net worth investor, I would think that you will need to invest in gold, just as an asset class in your whole portfolio.