Yes you nailed it, 31 + 11 = 70. You'll be here one day when I was 12 I thought I'd never get old either.
Regardless of my age or your age, when you pay attention to how many games from the past they are remaking and remastering, you should consider that today is not the golden age of gaming. You're blown away that an 11 year old game could be good, and I'm just telling you there were even good games before that as crazy as it sounds I know it was before you were born but yes good games existed before you were born.
If I was your age I guarantee you I'd be exploring older games I just have a curious mind like that and I think more younger people should not think the world didn't exist before they did. Some of the best games of all time were made in the 90's and between 2000-2010.
Here's a thought instead of thinking someone is just an old fart who has no clue what he's talking about, maybe since I experienced multiple generation of games including today's so I have perspective on both old and new games I might know what I'm talking about, crazy I know. Most of today's games have some connection to older games in one way or another in gameplay or something else. The industry copies each other.
You don't have to explore older games there's no obligation for you to do so, but there is a benefit for you to do so. I didn't give this advice because it somehow helps me. Last of Us was great, I'm just trying to open your mind to other great games but if you want to just consider me an old fart and you want to think Last of Us was the first game ever that was any good that's totally your call. The PS2 was one of the greatest systems of all time, and you could probably hack that PS3 and play PS2 backups for free and have a blast doing so, even if the graphics aren't super hi-rez definition.