Gunko age arguments

I dunno, just saw one or two people complain how Gunko is technically 15 because that's when she became Imu's slave and domi Reversi whatever even though she's walked the Earth for 77 years now.

​

It's kinda similar to people complaining about those gooning to Daki from Demon Slayer because she was 13 when she transformed into a demon but she's been living for a hundred years since hey, she's still technically 13, let's be mad at that.

​

Does it sound like bullshit or is it socially significant?