I am 18, I am going to be studying German in Germany for 10 months, and then go to a preparatory year (German studienkolleg) I will probably be 20 or 21 before I start actually studying in the university ( although I finished high school at 17 and got accepted in my home country's university, but it sucks, Germany is my only hope ) considering that I am really good at math and physics, and all I will be doing those 2-3 years is study ameliorate my level, will I be too old when I finally get a PhD? Knowing that I want to go to academics and do research, I may be 30 or 31 by the time I finish my PhD, which is the time that most physicist do their most notable work, how will it impact my career? and my chances of finding a position in a good university. Especially that some people get their PhD very young, and most people at 25 or 26. Also, will my brain work the same way? some people may say do something because you love it, but if I am gonna do something I love without the hope of ever achieving anything or advancing the field, or even effecting it, then I don't think I can do it. Also, is there no way I can make the period shorter? This is just not letting me think straight, I am starting to think of changing my plans to Engineering or Medicine ..