** I think the human race has every opportunity to improve. ** The medical field is research-based and dynamic. ** Using the internet, we can communicate with people online. ** I think we are better off now than before. This is an opinion: Your sentence that starts “Our grandparents had fewer opportunities” while grammatically correct, doesn’t communicate what I think you intend. Technology doesn’t equate to opportunity. I would follow the opening phrase with what they didn’t have in the negative.

My generation IS human race HAS can communicate (no to) In this one: "Our grandparents had fewer opportunities, such as modern information technology, mobile phone, the Internet, modern car." you need to put something between "fewer opportunities" ans "such as..." because they logically exclude each other. Maybe write something like: "Our grandparents had fewer opportunities. Unlike us, they never had advantages such as modern information technology, mobile phone, the Internet, modern cars."

"Young people have many more life opportunities nowadays than our grandparents did. However, our grandparents say that their lifestyle was much more secure. My generation is part of an electronic age. I think that the human race has every opportunity to improve. The medical field is research-based and dynamic. Far more people survive cancer today. Using the Internet, we can communicate with other people online. Our grandparents had fewer opportunities, they did not have opportunities such as modern information technology, mobile phones, the Internet, modern cars. I think that we are better off now than ever before." I edited it a little.

Aside from English, I agree that our grandparents did have much fewer opportunities in their everyday life, which is mostly due to they had no useful devices to communicate with unknown people. They were in an age of much less change or possibility, but on the other hand, they did not need too much complexity to be happy, which seems good.