How old does a coin need to be in order to be worth more than its base value?

Just average, ordinary coins (i.e. pennies, dimes, nickels, quarters) that have no special names.|||It can be old, or it can be brand new. 2009 nickels and dimes are worth many times the face value right now, because the mintage figures for them are the lowest in almost 50 years and people are going through pocket change looking for them. Scarcity is the primary factor, not age.|||Age has something to with it if that series is no longer made such as buffalo nickels. In the long run a coin to have added value as a collectible must be rare or scarce or historic. Some coins are scarce due to low mintage's, while others are scarce in high mint state grades but may be common in circulated grades. Your question is actually more complicated then just giving you a date. Very few coins from 1940 and up in circulated grades have much value unless silver and that is only due to the silver. Some in high mint state grades do have collector value. There are also cents that are error coins that have value. You need to get a price guide and do some studying, most guides are monthly at least on U.S. coins. Hope this helps|||a coin doesn't always increase in value just because its old. It has to be old and rare, and in good condition|||never really, unless there is a unique error on it