hi im new and I have a few questions about eggs. so ive collected quite a bit so far and Ive used up my 3 hatches. ive also noticed that there are 3 categories the fresh eggs, old eggs and spoiled eggs.

 so do my fresh eggs ive collected get old  get old after a certain amount of time? or spoil?

what if I have an egg incubating but cant hatch it? will it get old or spoil over time?