"Like sparks from a blacksmith's window" refers to the sparks that happen when a blacksmith is working. The meaning depends on the context. The context should usually be something like anger, exploding anger, or it could be excitement...
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Some people might not have saved a lot of money during their time working. Therefore, not having enough funds saved up in order to retire. Things are also more expensive than they used to be, causing old people to spend more money.
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