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SUBMIT YOUR IDEAImproved upon solution set by replacing athlete count null values with 0 so the total counts work (i.e. look at Vanuatu in the output). I also get slightly different average age values if I find the datediff by "days" instead of "years" and dividing by 365 (which I think is actually more accurate). I ended up just going back to "years" to match the output average ages. I also threw out the 1 Russian athlete without a DOB...
Video solution here: https://youtu.be/_0dTdZgBNl4
Here's my solution.