To be quite honest, if it weren't for recommendation, the title Old Man's War I wouldn't be attracted to reading the book at all. It was thanks to a tip that I started reading the work of John Scalzi and I can say that it was worth it.
The story takes place in a future in which humanity already inhabits other planets, but the problem is that we are not the only ones looking for planets to colonize, several alien races do the same, and most of them are hostile to humans. Therefore, it is necessary to have a strong and ever-expanding army to conquer new colonies and defend existing ones.
The only thing is that the minimum age to join this new space army is 75 years old, and that’s exactly what the protagonist John Perry on his birthday, he enlisted in the army, which attracts old people to enlist with promises to bring his youth back.
With a relaxed writing, and without bumps or jerks, the book flows at an accelerated pace, perhaps too much at times. Unfortunately, there is not much time to get attached to many characters, at most two or three, but the focus at no time is to keep creating many relationships between characters, it is action practically all the time.
Exploring the theme of interplanetary travel, Old Man's War it even has some physical explanations about travel and other means of transport used by the army. The author's creativity is evident throughout the work, to describe the procedures and tests carried out during the training of the new soldiers and also for some battles. With a special emphasis on a part that humans want to get answers from an alien race called Consu, the way the ritual takes place is really quite different, I found it one of the best parts, without a doubt.
Before you know it, you will be at the end of the book, which is practically an action from beginning to end, I recommend it to everyone who wants a simple, pleasant and unpretentious reading, of course, if science fiction is your type of book.