I have symptoms that sure sound like Cystic Fibrosis. can it be possible for a 49 year old man to develop Cystic Fibrosis earlier in life and not realize it?

What kind of tests do doctors give for Cystic Fibrosis?

no cystic fibrosis is genetic and would have caused you many problems way before now. go see a doctor and stop looking at WebMD.

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information.
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Cystic Fibrosis [CF] is genetic disorder that usually manifests itself in early childhood. It's unlikely that you have CF if you haven't had symptoms before your age.
Have you ever smoked? It's possible that you could have COPD [Chronic Obstructive Pulmonary Disease] such as chronic bronchitis or emphysema. Even if you've only smoked a few times, it is possible you could have developed COPD due to another genetic disorder, alpha-1 antitrypsin deficiency [trypsin can destroy lung and liver tissues if not kept in check by antitrypsin, which is not adequately supplied]. Definitely a scary prospect, but antitrypsin can be replaced if action is taken early enough. It occurs most often in people of European descent.

You need to be seen by a respiratory specialist for diagnosis.
Best of luck, and health,