\newpage
\appendix
\section{Supplementary materials}
\subsection{Masked words} \label{app:masked-words}
The following words are masked for age:
\begin{itemize}
    \item \textit{Young}: \textit{kid child, young, boy, little, baby, babies, childhood, babyhood, toddler, adolescence, adolescent, teenager, schoolboy, schoolgirl, youngster, infant, preschooler, toddler, student, girl,} and their plurals.
    \item \textit{Old}: \textit{elder, man, woman, old, elderly, grandma, grandpa, mom, dad, father, ancient, aged, senior, grandparent, senior,} and their plurals.
\end{itemize}
See Hirota et al. \cite{hirota} for a list of masked words for gender. No words are masked for race, as it is generally not explicitly mentioned in captions.