Are all coins before 1964 made out of silver?

No, not all coins made before 1964 are composed of silver. While many U.S. coins, such as dimes, quarters, and half dollars minted before 1965 contain 90% silver, other denominations, like the penny and nickel, were primarily made of copper or other metals. Additionally, some coins from other countries may have different compositions. Always check specific coins for their metal content.