Do not check your Tefillin. That is a bad idea unless you have some reason to think they might be Passul. You are allowed to rely on the Chazakah that your Tefillin are Kosher for you entire life. If you actually check and find out they are Passul then you are in trouble. Once again, your Tefillin are Halachically Kosher even if some time over the last 50 years the Klaf inside deteriorated. If you check and find out that they have, you will be Megaleh Lemafrea that your Tefillin have not been Kosher for who-knows-how-long.
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