Tullamore Dew?

Hey everyone! I am definitely no expert on whiskey but I wanted to get my friend an okay bottle for their birthday. I went with Tullamore Dew based on some online suggestions I found that matched their style and my price range.

Any way, now that I have it I've been trying to learn more about it and can't seem to find anything. I know they have a special reserve 10yr and 12yr but what about the original (which is what I bought)? Is it only aged for the minimum 3 years 1 day?

Also I was wondering what the best way to serve this is?

I've read that you shouldn't chill whiskey because it stifles the flavor but for some brands it's actually good to do that? I was planning on just serving it room temperature and offering over ice if people wanted it but any one have a good suggestion on ways to serve it?