I believe you're misunderstanding the ward system. A ward doesn't spark into a NPC like how someone who sparks into a family would, hence why they will always start at a fixed age and their character customization isn't limited to the genetics and gender of the character they spark into (instead they're limited to the basic tribe options that are available in the region). They will also distribute skill and attribute points themselves from a starting pool of points.
This might seem pretty inconsistent with the rest of the game, but it does act as a fail-safe for whenever a conflict result in the genocide of the local NPC population.
What requirements an orphanage have, and whether it needs a manager or not, is still unknown I believe. Though I suspect the structure itself may require a number of bedrooms that can act as a home for the wardens until they reach a certain age (starting out homeless would be pretty rough for new players).