I want to design a product details page in which user find all the details easily.

My father is 55 years old. He loves the online shopping but he used his mobile with full brightness so thats the issue come with me when i make an  interface with light colours and saw to him. He faced some problem in colour combination and then he told me he face the same problem  in other e commerce sites and there is one more problem he just want to basic details about product but he has to scroll to much so i came with this 
Because most of our users are 50+ age  we have to make some simple interface for them so they also enjoy shopping’s . Please leave your  valuable comment. Thank you