Since many older laptops just are not really made to work with 10, no matter if they say they are listed as OK to work with it, you would be better off buying a newer laptop if you really want to have 10.
While the older one may say it works, the hardware just really wasn't set up to work well with it. Then when you add all the newer programs, which you would need, then it gets a little out of hand.
Plus 10 is great for updating things without your knowledge, and without you being able to say no. Other software that works in 10 is the same way. Add to that all the things that are running at once, since the preload with Windows when it loads, and you are using a lot of resources. Older devices just are not set up to work well with all that.
Now if you were talking a desktop, that would be a different story.
Also, many games use a ton of resources, so if you like to game you would really need a newer device.