If Synch and Laura love each other and want to be together, there is nothing that would prvent them from doing so. He doesnt need to change his physical appearance for that and IMO it sends a bad message to say that needs to physically change himself order to be with her. Its not like he is a pre-teen. He's a man. One thats several hundreds years old yet looks early 20s. He doesnt need to look like he's in his 40s to be with someone that is also several hundreds years old that looks like she's in her 40s