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There is the universal age where babies are zero-years-old at birth and gain a year every birthday.

There is the universal age, where babies are zero-years-old at birth and gain a year every birthday.


I have seen the first sentence and I was wondering if the second one with a comma is better or correct or the universal age where...is fine to use?

What do you native English speakers think? Thank you so much as usual.

Comments  
Hans51I have seen the first sentence and I was wondering if the second one with a comma is better or correct

The comma is necessary. The hyphens are wrong.

Hans51the universal age where...is fine to use?

Yes, people do it all the time, but it is awkward because "where" is literally a place and the word can never quite shake that off. I would recast to avoid it, perhaps "In the scheme called universal age, babies are zero years old at birth and gain a year every birthday."