If he’s the Uncle Henry from Oz then he’s not in her age range as we know that Dorothy (who is around 16) went to Oz 10 years before the Curse was cast, and then you have to add in the additional 28 years of frozen time for SB. Meaning that Uncle Henry would have been uncle to a 16 yr old for 46 years before S3B. Making him at least 50ish and probably closer to 60. Christopher Gorham couldn’t pass for 50 as they have him styled and make-uped right now.
This is Once the guy could be the same age as Emma, or 50ish is sure lots better then someone who is 200 or 300 years older then Emma and is older then her own parents and is her Century at least.