Average age of hitters this year is 21.3 and the average OPS is .674. This year it's leaning towards pitchers so far.
They're 18 and 19 and crushing the league averages. It's very impressive so far
To keep tabs on the various leagues and whether they lean towards pitchers or hitters, I use
http://www.baseball-reference.com/register/league.cgi?year=2017