How old must a coin be to become collectable?

Many detectorists, including myself, often find coins that date to Victorian or more recent times. Generally we consider such coins to be relatively common because of the large numbers produced and don't pay much attention to them. Are we missing a trick by doing so and is there a thriving market for such items, particularly those in good condition? Here are a few of my better condition examples of such coins.

 

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Yes, the newest stuff the U.S. Mint sells these days for prices over face must be deemed “collectible.” There is so much of it that I have thrown up my hands and have labeled it as “junk,” but somebody must want to add it to a collection.

I draw the line at metal detector finds which are badly corroded or which had to be severely cleaned to figure out what they are, but there are those who would find them interesting.