Board Thread:Ninjago Wiki News/@comment-25095204-20140703085642/@comment-3214109-20180411023518

Found this on Tumblr:

HARUMI S1=10 S8=14 LLOYD S1=11 S8=15 (17) NYA S1=13 S8=17 KAI/JAY/COLE S1=15 S8=19

"Made headcanon chart to try to figure out what Harumi’s age might be in relation to Ninja.

She was 9-10 in Season 1, according to Tommy A., and apparently a bit younger than Lloyd. According to the Hagemans during the Brent Miller interview, Lloyd became Nya’s age, two years younger than the other Ninja (not counting Zane, the 40 year old teenage robot), and was “emotionally” two years younger than that. Assuming emotionally means his chronological age.

And while the idea of Lloyd only aging up like two years kind of severely lessens the impact of Lloyd’s sacrificing of his childhood, it sort of explains his voice still being high until Season 8, I guess. And trying to keep Harumi’s age as close to Lloyd as possible."