1) You can protect your savings against the currency devaluations.
2) You can protect yourself should a severe banking crisis occur, should one of the big banks collapse for example.
3) You can protect your purchasing power as inflation is steadily rising.
4) You can protect your portfolio and wealth if an economic crisis in China, the US or Europe occurs. Even if an economic crisis would result in (temporary) deflation, you would be relatively better off with gold than being in paper money or paper assets.
5) You can protect yourself against the uncontrolled actions of governments, who have excessive debts and try to solve it with huge money printing
6) You have no counter-party risk with gold and silver (contrary to paper assets where there is always a counter-party risk involved)
7) You should own gold because the trend is your friend