Tbh, some people manage to stay almost the same from mid 20's to late 40's, then they start to age slowly.
My older brother is 47. People still think he's on his early 30's. I'm +35, people still think I'm on my 20's, skin health apps included
. Genetics and clean living I suppose.
But there's no way Tseng would have looked like that at 15, when you are yet to completely lose all the baby fat. Again, lazy lazyness. They could have modeled a younger version, put the same hairstyle on him and make him say "Good evening, I'm Tseng from the <whatchamacallit> department from Shinra. May I have a talk with your daughter Aerith?"