1. As long as I've played this game, just about every NPC treats me like one thing, an adventurer with experience (AKA slave convenience).
2. Your a mute, voice actors don't even have to try. You know how many high pitched voice selections we have already?? look at them yourself. Btw did you also know that it took a year to make a new character race? They're aware of how difficult it is and are very careful of how things connect with the story.
3. Your character is potentially the same age as they were in FFXIV 1.0, time travel, go figure. Who's to say you weren't a kid when Hydaelyn spoke her mystical voodoo to you.
3. Equality can easily be determined through experience and respect, not just age. Haurchefant can see you as a younger sibling, easily changed in text and not a problem for SE since they're used to script changing (other races and genders), not that it's your problem exactly as your not the developer.