You can use it, but it's not necessary for the kata.

Would it be alright to leave a non-spoiler-tagged comment just saying that "BigInteger" exists as a class in java?

I spent 2-3 days having int overflow problems, and I'd looked for larger integer types in java without "BigInteger" coming up in the results.

I'm really new to programming, but I managed to "complete" this with my IDE's help. I still don't understand some things. I'm solving this in C.

So from what I gather, what I returned was a hexadecimal pointer whose 8-digit address was the same number value as the second-oldest age?

Is there even any way to check the oldest age from what I returned?

I'm sorry, I just really don't understnad this one.