Responses
I think it’s more of an issue with ethics and morals than technicalities? There are a lot of things that are technically okay, but ethically feel wrong and this is kind of one of them... (and on another note I personally feel like now is not the best time to introduce a romantic side plot, which is a feeling I think most people share)

I don't understand why people have an issue if Arthur gets with Tess. He is an individual REBORN. HE HAS A SECOND CHANCE IN LIFE. AND YOUR TELLING ME YOUR GOING TO WAIT UNTIL YOUR 20 TO DATE SOMEONE JUST BECAUSE YOU REMEMBERED YOUR PAST LIFE AS A GROWN INDIVIDUAL?
But I don't see the difference of when he gets older. When he gets older so does everyone else. So he will always be older than them no matter the age.
I don't understand how people making it a big deal. Oh she's a child well so is he. Last I check they like the same age. He's just mentally older cause he remembered his past life.
I don't see this as an issue unless he is looking like his father with his grown man body trying to get with baby gurl. Then it's an issue.
I mean it's not like he can come out of no where and be like I was reborn. Like I would've be like WTF?