If you're investing in the Susan B Anthony dollar, remember that the coin's condition is of utmost importance. Most collectors are willing to pay much more for a coin which is flawless, and they will seek a heavy discount if the coin is in a tatty state. Of course older coins are generally more valuable to collectors, but more than just age can affect the value of a specific coin. Of course age and rarity make a coin more valuable to collectors, but they aren't the only factors that matter. Coins can be valued by many factors, the most important of which is, of course demand.