First of all go to IMDB - https://www.imdb.com/search/title/
Select the title you like, for example "short film".
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write the year of your preference for example "2020 to 2024" as I always do.
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On the plot instead type the word "10-year-old".
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Or.
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Or.
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Finally, scroll down again and click in the yellow bar where "Search" is written and after which titles appear on the films where there are male and female child protagonists, for the age you can enter "9-year- old" or "7-year-old" whatever you prefer. But be careful in the bar where "Plot" is written, you don't have to put all the keywords in the same row because there is no title, you just have to put a keyword like the one I wrote above. I hope that my little guide has let's say taught you.