THAN is used in comparatives:

• I’m younger than my sister.
• A motorbike is faster than a bicycle.
• I’d rather walk than drive there.

THEN is used in several ways, for exapmle:
– to describe the next event in a sequence
– to mean “at that time”
– to mean “in that case”

• First we went to the post offiece, and then we went to the park.
  (then = next event in the sequence)
• Come to my house at 17:00, I’ll be ready then.
  (then = at that time)
• If the bank is closed, then you’ll have to make the deposit tomorrow.
  (then = in that case)
  

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