Do german boys like Chinese girls? I need your advices... thanks...:)

Hi everyone,

I'm a Chinese girl and live in Singapore now. I have some German friends; they are very friendly and nice. I like them very much. So, I want to go to Germany after finishing my PhD, but before I making the decision, I have some doubts to ask. I hope you guys can give me some suggestions. Thank you in advance.... ^_^
1. Does German boy really like Chinese girls? Do they care about the age (30-33years old) and height (1.63m) of girls when they considering marriage? because for our Chinese girls, most of us only get this height. :) but german people are very tall (even sometimes I feel painful on my neck when I talk to my German friends for a long time)... And the age is because of the education.
2. Is it difficult to get a postdoctoral position in the German university?
3. Do I have to learn to speak German if I marry a German boy?
(Because I want to make a placid home in my future family, and communicate with my future parents-in-law frequently, do parents in Germany mind to speak English?)