Interestingly there is no actual period for the solder to end up bad. It can provide you with a long-lasting service or it can break down for a while.
 
Whatever it is an electrical solder or plumbing solder, it can become fruitless. In some cases, a person may also have a 40-year-old solder that is active and effective. On the contrary, the wrong solder can also break down after a time.
 
I think the new one can separate easily for the quality and type of solder. If the quality and type of solder are in suitable condition, then even a backdated solder can be a long-lasting solder.
 
For separating a solder, soldering flux contributes greatly. So, you have to be aware of the life of soldering flux.

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