It's work. I had similar problem, but then realize, that i should't create new array, sort and return it (what is the good practice for sorting array). You must sort input array itself only.

I started this kata from TS. And in TS explanation for this kata hasn't table with numbers to match issuer. I couldn't understand how find this rule until open this kata on JS. It is unacceptable has differrent explanation for different languages.

It's a spread syntax, than allowed us to find max age in array of age.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax