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How old is this WBSE?

How old is this WBSE?

This looks like a bird not yet fully grown. I once read it takes them several years (7?) to moult into full adult plumage, may I know how old this one probably is?

2013.12.26 Sai Kung Public Pier

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Second-year bird according to Ferguson-Lees', well-advanced to 3rd, I believe.

S L Tai

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Yes, a juenvile born last year (2012).
WBSE takes about 6 years to attain full adult plumage.

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Thank you SL and Gary for your kind advices!

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