JSON template help!

Hi all,
I’m using a REST sensor to parse the json value.
How do I get the “age” value from below?

{"sage":{"Sensor Start":{"found":true,"treatmentDate":1565085441000,"age":311,"days":12,"hours":23,"minFractions":18,"display":"12d23h","displayLong":"12 days 23 hours","level":2},"Sensor Change":{"found":false},"min":"Sensor Start"}}

I got it!

value_template: '{{(value_json.sage["Sensor Start"].age)}}'