These tests don't prove much to be honest, but the question I ask, is why does it matter to you 'how old' you are?
Yes, you can tell from how a person behaves their soul age, but not all the time. I have written a piece on the soul stages, rather than age;
http://thesoulexpedition.com/the-soul-stages/
What I recommend is to not think too hard about where you fit in, but focus on your soul bonds and connections and any karmic issues instead.