I am pretty sure that that depends on what country you are talking about.
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There's no specific answer. A coin can be valuable because it's scarce or made of precious metals. Some old coins were minted in such large quantities that they're still common among collectors while other more modern coins were only made in small numbers and are worth a lot more. Even within the same date and denomination, values can differ radically. Among US coins, for example, a 1909 Lincoln cent from Philadelphia that doesn't have the designer's initials VDB can be bought for a few dollars because millions were struck. However only about 484,000 such coins that did have the designer's initials were made at San Francisco; these can be worth hundreds or thousands of dollars.
For the collector value with the exceptions of errors and specially made proof coins, the penny would have to be made before 1959.
The Krugerrand coin was minted in 1967 making the earliest coins about 44 years old.
The word we'll is a contraction for the prounoun 'we' and the verb (or auxiliary verb) 'will'. If the speaker and another person are both going to be five years old, then it is correct to say: We'll be five years old. (We will both be five years old.) If the speaker is referring to them self only or any other persons or things, it is correct to say: I will be five years old. You will be five years old. He will be five years old. She will be five years old. It will be five years old. They will be five years old.
It depends on what type of coins you have. If the coins are collectible coins, that is, old, high grade, and desirable, the best place to find the value of them is in the Red Book coin guide or take it in for an estimate by a coin dealer. On the other hand, if what you have are low-grade, common coins primarily for their bullion value, I will include Coinflation which is a website that shows the precious metal content of pre-1965 US coinage and Canadian coins in the related links. You might also want to check Ebay for what people are paying for the coins you have. Keep in mind that you should never clean old coins because that destroys the value of them.