The problem is google will have already indexed them, you can request noindex but its a request only once its in.
You are better off building links within your site to point to the pages you do want indexed and removing any that point to the old pages.
You can use screaming frog and if you have less than 500 pages it will crawl your whole site for free. There you will be able to see how many links are going to each page.
If the pages are of no value anymore then you could think about removing them.