The fan is very audible, and then winds down to almost quiet - why? how do i make the fans be quiet?

the fan is very audible, and then winds down to almost quiet - why? how do i make the fans be quiet?

hi, re my fans, this issue is about 1 week old and the machine is behaving normally.  However...the bottom of the machine is quite hot (but it has always been quite warm) and I do have my battery settings in preferences set to high performance (uses more memory.)  Also, I often stream video thru Firefox while working on medium/large Photoshop Docs as well as leaving ITunes or Preview open in the background.  Also, I leave my MacBook on continually...it's 3 years old...should I be concerned?  Is this issue indicitive of a battery problem or Sudden Computer Death Syndrome?

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