Almost all of the toys are adults

the hour of joy happened in 95, the game takes place in 2005, the experiments started around 1989, assuming most of the orphans were transformed pre 1995 at around 10 years old they'd be in like there 20s. the orphanage opened shortly after poppy was turned into a doll and Harley Sawyer was old enough to be both an orphan and come back later to work for playtime I assume most the toys are around his age