When do "Too old" coins get removed out of circulation & how do they identify which ones to remove ?

Question

Paper money tends to disintegrate but when it comes to coins how or by whom do they date sorted and removed from circulation

Answer 1

The most important criteria of a coin is its ability to last a long time. Hence the great number of ancient roman coins still available.

Coins are removed from circulation , normally by banks when they are counted and the main reason  is if they are bent or damaged or fall below a nominated weight.

Another reason for their removal is when a change in the legal status occurs, ie a new series of coins is issued and the old coins no longer have a legal currency status. This happens normally by some form of national decree, and is usually accompanied by a period of grace in which to return the old coins for new ones. some countries do this on a regular basis, some like the USA and I think also Australia have the policy of letting you utilize or return for exchange all old currency.

Only thing with that policy is that a lot of the older varieties of coins are worth more to a collector than their face value... be careful taking them to banks or spending them.