Due to my country's education (we finish high school later than other countries), a year off, doing master's degree, I am finding myself in my first year of PhD in States being 26 years old, possibly graduating when I am 30. I have recently become very anxious about my age, since scientific career has been always my goal, I feel like I am too old and behind everyone else. In Europe, where I am from, I have been told that age does not matter as much, and what matters is papers/scientific output, especially since the end of PhD, in support of me pursuing the doctoral degree in USA, where it takes longer. I am doing my PhD at one of the top tier schools in a very prolific group, where I am surrounded by people that got their PhD when they were 25... In addition I know from experience of me and others that in my field (physics) women are heavily biased against at all stages. Also, my field requires completion of usually 2 post-docs before applying for positions, which would take around 5 years.
I am looking for some input on this and how realistic my chances of staying in academia are, how much age matters when hiring for post-docs/faculty positions (in Europe) and how to cope with age related anxiety in academia.