I'm sure those two stats are definitely related. What a childish thing to say.
The word "testosterone" is not mentioned on this page at all. Nor any other hormones.
Well I was just noting a suspicious correlation. (Also childishness is up a lot more than 50%, in case my tone was unclear :)
But you've given me quite an interesting endocrinology research project here. Last I heard, the root cause of the drop remains unknown. (And it's still dropping.)
Testosterone down 50% since 1970.
Childishness up slightly more than that.