How old does an american coin need to be to be mad out of silver?

how old does an american coin need to be to be eather copper or silver

or just worth something



thanks alot i couldent find this info anywhere
Typically quarters, half dollars, and dimes are 90% silver 1964 and before. Nickles dated 1942-1945 are 40 % silver cause of the war.

To check value check this web site: http://www.pcgs.com/prices/
coinflation.com



Interestinly, the current nickel is worth 7 cents in it