Ok...this is a bit messed up. Forget the age gap and all the problems that'd create, this would be serious trauma for the son/friend. The girl you've been friends with forever and are starting to think might be into you a bit is actually after your mother.
Is he so awesome a karate practitioner (unlikely or at least as unrealistic as can be)? Or does gaining levels actually give him increased strength/power and he never noticed?
Sure, there's certainly other factors, but the US for example also has horrible working hours for the pay many people receive as just one example country, and there's no population issue there. A big part of that is the US has a large immigrant (yes, both legal and illegal border crossing)...
Which is still negative growth. 2 parents making 1 child, and every 1 in 3 making 2 children isn't even replacing the existing population. It's a Huge problem for the future, made even worse by Japan's average life expectancy (very High), and their xenophobia making it extremely hard to...