The only thing I'll say is, that "extras" might vary per client. That is a flaw with a forum like this.
How is that a flaw with the forum? Most intelligent members know how to read into reviews based on who is posting. The flaw lies with those members who bullshit in their reviews or leave things out.
A guy in his 30s could have a completely different session than a guy in his 60s. Hate to say it. But, it's true. It depends who walks through the door. The right person at the right time. Chemistry and attraction. The provider needs to feel good about you.
I'll agree with the age thing to a point. Perfect example is Genius. Although you'd never know it by looking at him he is closer to the top of your age range and he is one of the most successful guys on here when it comes to getting extras at massage places. But for the most part older guys just know how to put a girl at ease.
A lot of times younger guys think they are going to make one of these girl meet them on the outside then just get lead around by the dick.
Also YMMV isn't really what it seems at AMPs and LMPs because some people just buy into the "you're special, this is only for you" only to later realize this chick is raw dogging half her clients. Perfect example the Amy Rieki thread.
What counts most when it comes to getting extras out of these girls is experience in the situation and having some game.
And don't forget they're playing the game too. They spot a lonely desperate guy and take him for what they want.