Are pre 1965 quarters rare

They aren't rare, they are, however 90% silver and worth a bit over $5 each at the time of writing in silver content alone. Many, many, many, pre-1965 quarters were made but simply the fact they were made out of silver is what makes them valuable. Now, there are, of course, some rare years of silver quarters, but there are also very common dates (like 1964).