Well, howdy! Don't tell me you don't know the difference between than and then!
Than and then sound like similar words, but they mean two different things…
Than is used when making a comparison.
In these two examples, the words hotter and bigger come before than. Than is often accompanied by similar words–like less, fewer, more, greater, and so on.
Then is used when referring to time or a sequence of events. It can also be used to indicate consequences.