I'm a programmer and my answer would be more like the tester's answer.

But okay I also used to be a tester so this comment is probably invalid.

This all assumes all years are measured by the same orbit with no mixing and matching planets or space habitats.

The standard earth year had not been adopted system wide

[Test]
public void Sister_IsAstronaut() 
{

Managers when a tester does this in a planning meeting, asking for more time to write better teats: 😠

Managers when a staff level engineer does this in a post-fuckup root cause analysis meeting telling everyone what went wrong: 🤤

Managers when the tester points out it wouldn't have happened if tests for it had gotten written:

That's a good tester.
In my experience coders usually make absolutely terrible testers, testing only for the most inane case, or just positive cases (ie, it does the nominal case without bursting into fire).

Also, we first have to define more precisely what 'being 2' means. E.g., if we just count birthdays and one of them is born on Feb 29th in a leap year, that person 'ages' with 1/4 of the speed.

This may be why I hated math.

Now that’s thinking like a lawyer!

You could also simplify by saying that assuming neither of them are dead, at some point while he is 44 she will be 42. Whether or not she is actually his sister seems to be irrelevant, she was stated to be his sister, so regardless of biological data, it is being presented as a fact assumption.

The space stuff is not currently possible and can be disregarded as well.

Ugh, this is what you get when there's no AC.

Pentester:

42, -7, Yellow, false, null, {{7*'7'}}

!lemmySilver