If “half your age, plus seven” gets you the youngest age society will accept, then, “minus seven, times 2” should get you the oldest acceptable age.
So (18-7)*2
is 22. A mom with a 3 year-old is still a mom.
And if that doesn’t suspend your disbelief, you could still slap on “step” to the relationship label and the script writes itself.
I own this.
I’m guessing the author doesn’t have this issue, but the model sold in the US has a volume ~~limiter~~ limit on them. My daily headphones aren’t easy to drive, so this was a concern I have that many other people might not care about.
I ended up having to import mine to get a device that doesn’t have this enforced.
Edit: Sorry I was clumsy with my words. It’s a limit on volume, since it’s an option for high gain.