My macbook pro is 3.5 years old now.. and a loud fan

my girlfriend has a new macbook and its so so silent watching/streaming videos..but mine is loud and the fan goes crazy..is this normal? i cant remember if it was always like this in the past. why would my fan work so much more than hers? Thanks

This might help:
Intel-based Macs: Resetting the System Management Controller (SMC)

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