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I feel like the numpy version is most concise, most readable, and most array-ish:

np.sum(age>17)

(Assumes age is a np.array)

Yes, this is VERY close to the APL way: +/ages>17

OP here; maybe I'll add a comment to the article to make the comparison between NumPy and APL for this expression. Thanks!

APL (along with Matlab, K, Mathematica, etc.) was one of the influences for NumPy anyway.