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No, you cannot age House Sparrows once they have moulted in the autumn, as both adults and juveniles undergo a complete moult at that time. The yellow on the bill is not an age-related feature at this time of year. Just a female, age not possible.
My Flickr photos...
Thanks for the clarification.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 50.5, -5.1
OS grid ref: SW8572