It's difficult to tell juvenile males from adult and juvenile females. They look almost identical. However, nearly all birds with noticeably streaked throats are young males. Their throats usually have some dark streaking — green, black, or sometimes tan. By late August, you may see a few red throat feathers, but the juvenile males do not get a full gorget until their first winter.

"Juvenile male doing a Saturday afternoon ballet."
Amy Evoniuk from Newburgh, Indiana on August 27, 2016