For those who have read "Road to Reality" by Roger Penrose.?

Books have no age limit. Look through the table of contents. You'll see that the major emphasis of the book is mathematical. Skim quickly over the math that's beyond you and see if you can still get useful content from the book. He tells you about Euclidean geometry to tell you that it's insufficient for modern physics. The Platonic world of mathematical forms is really the foundation of all the forms of string theory. I definitely would not recommend this book as a first book in physics for anyone without a deep and strong mathematical background, at least PhD level. There are plenty of others written for a more general audience.