it's done except the camelCase method, unless someone is willing to add the reflection thing to the sample tests to avoid invalidating 2,000+ solutions

Unfortunately, the author prohibited editing the test section. That eventually doesn't allow updating the main code as the tests are relying on the capitalized method name.

The requirement is to not include the min and max values in the sum.
This implies that the value has to be 0 when the input has less than
3 elements. No change needed there.
I think this should have been a 7 Kyu, I liked it.

Reopening dinglemouse's issue:

The Java version needs a bit of a cleanup

static class

public static class AgeDiff {
java.lang.RuntimeException: /AgeDiff.java:1: error: modifier static not allowed here
public static class AgeDiff {

string --> String

public static string CalculateAge(int birth, int yearTo) {
^
symbol: class string

Also the method CalculateAge should be renamed to calculateAge

Would be nice if someone could finally fix this issue.
Nice kata otherwise.

Shouldn't '[]' be removed in optimization?

Instructions are clear and I like Katas that are somehow 'related to the real world'.
Will this ever leave beta? Looking at the responses here it looks like the makers
abandoned ship. :D