First I am a GenX male, let’s say close to the middle of 30s. I was in University was just when the second have of the second wave of feminism kicked off (post Thomas/Hill trial) My school had it’s own scandal before I got there and got a head start as a feminist PC experiment.

My premise is that many (not all) GenY men have been subjected to the excesses of “Feminism Gone Wild”(many lawyers too) in treating maleness or boys as the enemy both cultural and in schools as well as curriculum changes that I was only subjected to for four years for let’s say an extra decade.
http://www.associatedcontent.com/article/100299/4_year_old_accused_of_sexual_harassment.html

For some reason I don’t think they were taught or allowed to actually become full men as the system told them that was bad, so the became like “Peter Pan” as you say.
http://www.amazon.com/War-Against-Boys-Misguided-Feminism/dp/0684849569

Strangely besides some of the societal and workplace PC crap gone too far that annoys me, but doesn’t change me…I found observed this phenomenon myself by accident…as well as an underlying feminist backlash from these GenY men with strong misogynist and sexist tones.

I was dragged onto Facebook by my sister and friends to stay in touch and document my life apparently. Being very political I got excited about the US Presidential Primary race and joined groups to discuss it and other unrelated issues.

Then I started seeing the shoveling of what I call “Hillary Hate” from these mostly Obama supporter men and regardless of your opinion of her…as I pealed back the layers it really seemed like she was just a symbol to them of all the constraints and negative crap that from their standpoint feels like oppression of their gender coming out rampant at the acceptable target of Hillary.

Similarly I noticed that these GenY men seemed to act far more childish then their age would suggest. Not all of course, but it did seem like far too many taunts, rants and tirades were coming from them and they had/have hair-trigger emotions. There was always a few exceptions, but it was only made more stark in comparison to the GenY women.

The GenY women of all ages seemed to be much older than their age would imply. Far more interested in a conversation or debate over a rant. I even mistook a high school girl on a board as a College Debater trying to bait me, because here school name was really close. I had many good discussions on the boards with these GenY women. (well and lots of others too;)

I think I found that not only were they respectful (vs. some really annoying GenY male trolls while we were trying to determine the fate of the free world), but I got the distinct impression that men their age didn’t treat them with respect or let them actually talk, let alone listen as often as they would have liked.

So beyond the Feminist second wave (mostly Gender Feminism) that ended up lifting up young women and pushing down young men in GenY, perhaps there was two other influences as well.

1) Testosterone levels have been dropping like a rock in men/boys for the last 20-years.
http://www.ourstolenfuture.org/newscience/reproduction/2006/2006-1210travisonetal.html
This might delay puberty and/or suppress some normal male development…generally bad for men.

2) Related to 1) The age of Puberty in Women has been getting younger:
http://www.livescience.com/health/070904_bad_puberty.html

Most likely cause of both in my opinion is chemicals and hormones in our food and water supply.

Maybe the GenY men are being like “Peter Pan” in their twenties because they felt repressed as men in the youth, maybe it’s hormones or chemicals or maybe they avoid responsibility in a world that said no matter what happens it is always going to be their fault.

Lemme guess DRIVE THE INFORMATION AGE like we have been doing since it started. A lot’ve guys are dropping out of Tertiary education to start their own businessness. Saying alpha males is on the decline is another false statement I’ve heard about generation Y.