This doesn't change the meaning of the word modern, though. It just uses a different scale. The same way the Moon is "right next to" the Earth.

However, when you tie the word "new" or in this case "modern" to a time period that was over a hundred years ago you are just setting yourself up for failure and have to make do with calling things "after new" or in this case "post modern". But then where will this end?

What was wrong with calling periods proper names like Renaissance, Baroque and Romantic?