Hairline crack on toilet

[thibs]

This toilet is about 4 or 5 years old and 3 years ago started to notice a crack on the front rim. It has been getting worse but slowly. I think that at some point this will be a problem, but should I consider this an immediate issue and must replace the toilet?

Attached 2 pictures

Thank-you in advance for your advice.

 

[Pat the Plumber CIL]

Will only get worse over time , doubt it will crack all the way through at once . Keep in service until it leaks .

 

[havasu]

I sure as hell would not want to be sitting on that thing when it finally decides to split in half. I mean, what does a trip to a hospital cost?