You can create discrete segments from continuous data. Inside Lighthouse, under the Analysis menu, you can first set up a filter where you define logic, like QuestionName < 30 and QuestionName>30. Then also under the Analysis menu, you can add columns to your data based on those filters, like Age2 where you assign a 1 in the data if they are in the first filter or a 2 if they are in the second filter.
Alternatively (and maybe a little easier in your case) is you could download/export a CSV of the data, delete all columns except respondent number and the age column, then in Excel write a simple if statement to produce the 1/2 values yourself. Then you can import the new CSV back into Lighthouse to append your new variable.