and supernatural one of the most popular shows on cw sam and dean winchester are played by actors well into their 30's
They all look like grown men of 30 to me, them being good looking guys doesn't mean they look younger and 30 isn't old anyway.

There is some difference. In the case of 300, they were shirtless in the film, so the poster was just representing their actual look. It wasn't parading them for no reason.Tell that to the cast of 300. The whole movie males went shirtless.
Diggle is HUGE. He makes Roy look tiny by comparison. In the interests of fairness and equality, I demand that Laurel, Thea, Shado, and Felicity get shirtless posters as well.
Because Sabretooth, Gambit, Deadpool, and Wraith didn't have shirtless posters. Season 1 just had Oliver shirtless (Its even on the dvd cover) and it was fine but it is different when you have all of the male cast shirtless.
Oh no of course not people who are 30 generally look like 20 odd year olds. I just think some were expecting these seasoned vets that we were never gonna get.
Be interesting to see how Gustin does for sure.
Of course, you do realise that when Supernatural first started, both the lead actors were in their mid-twenties. They're only in their 30s now because the show's been on for years.
t:I think that's ridiculous. But gotta get girls watching on the CW I guess.