Koz, MPEG2 is just a compression and container standard. It can handle various resolutions up to and including 1080p. Whether the content stream that's being compressed onto the disc and then decompressed for your viewing pleasure is highish or lowish density depends on the content provider.
But most important here is the fact that a 68 year old guy is on the forum discussing such standards. When my dad was your age there's no way he and I could have had such a conversation about the tech at that time.
