Argiope aurantia (juvenile)

How do we know that this is a juvenile? The stabilimentum (reinforced area) in web makes a vertical zigzag band above and below the middle of the web when produced by a mature spider. Juveniles make a circular stabilimentum in the center of the web as seen here.
Spider in it's web
Image Captured with a Nikon D300S Camera, Nikon 80.0-400.0 mm f/4.5-5.6 lens, focal Length 400 mm, ISO 400, 1/200 sec at f/5.6.
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