Hello, I am senior in electrical engineering course. However, my dream has always been to study physics. I am worried because I am 27 years and have no contact with the main physical disciplines such as classical mechanics, thermodynamics, optics, among others. Which means I will need to study from the start to be able to reach the level of undergraduate students in physics. And considerating that my field interest is cosmology, I will need a solid basis or knowlodge. For me it is not a problem, but I have no idea how long it would take to complete this process. Because in physics it is need to do the things step by step, and I am worried about my age. I bought some physics books, such as Arfken (Mathematical Physics), Symon (Classical Mechanics), Taylor (Classical Mechanics) and Griffiths (Electrodynamics), to study by myself. How should I proceed to continue pursuing this dream?