Hello Gmat clubbers

I am glad I discovered this forum and this has guided me in my journey to the GMAT test day. Thanks to the posts dedicated to novices at GMAT, I am now studying Kaplan Premier, bought OG guide, made a study plan, installed the version of Kaplan on my iPad then I can study when I am traveling, etc. I even realized that the best time to study is not after work - I work full time, but before it (thanks bb for the priceless advice), so I set my alarm to 6am everyday and try to study at least one hour in the weekdays and two to three over the weekend.
But, I need some support from you. I am Brazilian, female, 35 y.o, more than 10 years WE and only now I had opportunity to stop to study for the GMAT - due to personal situation. I work full time as Manager and I am based in Zurich, so I am targeting schools close by and I wanted to go to top schools (such as Insead, IMD, IE, ESADE, etc). It was always my dream. First topic I need support: I just realized I am "maybe" too old for full time MBA. And if I really want to go for it, I might even get it. But, then I need to have a flawless application and that includes a flawless GMAT score

Do you know cases of people at my age being accepted to top b-schools for a full time MBA? What do you think about my case/ profile?
Here is the second topic where I needed you support: I had to re-start from scratch - even the most basic and simple calculation seemed impossible in the first week (I am out of the school since 20). I am entering in the third week of studies now. It is evolving well, but I just panicked last Sunday. The amount of content is huge!!! I did not yet take the test, once I would not make it that far - I might be below 500, sure. Is there any possibility that I will get there reviewing and practicing? Is that realistic? I see many cases of you guys going from 600 to 700 in 3 months. So, in 3 months can someone goes from let's say 450 to 650 (at least)??
I am doing my best - I travel a lot and work a lot, but I am trying not to complain and do what I have to do. Social life is inexistent, meeting friends is undefined and TV hours a day are minus 2 hehe
I appreciate any supportive words - as well as the ugly truth. Ciao!!