Is two-month old eggs laid by backyard chicken still edible?
You can test an egg for its freshness by placing an egg in a bowl of water as seen here.


If the egg sinks to the bottom and lays on its side, it should be fresh and safe to eat.
If the egg sinks to the bottom and stands upright on one end, it should still be fine to eat.
If the egg floats to the top, it's not fresh but not necessarily unsafe to eat. In this case you should break open the egg shell and smell if there is an unpleasant odor see here. If there is an unpleasant odor, you shouldn't eat the egg.