Method partially based on the excellent work described in:
 Uchida, Yusuke. “Age and Gender Estimation.” GitHub, 21 Aug. 2020, github.com/yu4u/age-gender-estimation.  Agustsson, Eirikur, et al. "Apparent and real age estimation in still images with deep residual regressors on appa-real database." 2017 12th IEEE International Conference on Automatic Face & Gesture Recognition (FG 2017). IEEE, 2017.  Pei, Wenjie, et al. "Attended end-to-end architecture for age estimation from facial expression videos." IEEE Transactions on Image Processing 29 (2019): 1972-1984.
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