Responses
As long as she's in legal age, it doesn't really matter. In one show I watched, the girl was 100 years old while the guy was 400 years old. Then, sometimes the guy is 900+ years old and the girl is only 20+ years old. Also, just look at them being both mentally adults in a kid's body.
Are you talking about Goblin?
On the second part, yes.
Can I know the title of it?
I want to ship her with lucas but even if you add all her 3 lives is still feel wrong ┗( T﹏T )┛