To include a slider range facet, add to your HTML

 <div ex:role="facet" 
   ex:expression=".age"
   ex:facetClass="Slider" 
   ex:horizontal="true"
   ex:precision="100"
   ex:histogram="true">
 </div>

Remember to assign valueType:number to your data in order to use the Slider facet:

properties: { 'age': { valueType: "number" } }

Supported settings include:

setting name	type of value	default	choices	meaning
ex:facetLabel	text			what to show in the header of the facet
ex:histogram	boolean	true	true, false	If true, the slider will be displayed as a small histogram representing the data under the current filters. If false, the slider's just a line.
ex:precision	number	1		sets how the slider rounds (if precision is 10, it will round to nearest 10, etc.). Decimals are valid (e.g. a small range might have precision = .1).
ex:horizontal	boolean	true	true, false	specifies to the orientation of the slider (horizontal or vertical).