And there's even more pre-ethernet POTS wiring. But most of stuff built or renovated in the last 30 years has gotten fiber put in. Which is also much more power efficient than the faster ethernet standards over twised pair.

(Also your cat5e should do 10G for the most common short distances, it's not categorically different, just has looser signal integrity specs than Cat6. Just isn't guaranteed over the 100m max specified distance)