If you enjoyed something as a much younger person, and enjoy it as a much older person, it is very unlikely that it is the thing itself that you are enjoying. To test it, you can try giving that thing to someone your age and see if they enjoy it (they will most likely think it's a nuisance). To experience it yourself, you can try what kids are into these days or even better try something that people used to like long before you were born, in which case you will very likely see these things as pointless quite quickly. If you observe these things, it is easy to see that nostalgia is enjoyable because it is about associating your youth and naiveté with the object of nostalgia. If you grew up, you would see that it is just some distraction that merchants brought to you to profit from your stupidity. If you realize this, you'll enjoy not having to deal with that shit a lot more.
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If you enjoyed something as a much younger person, and enjoy it as a much older person, it is very unlikely that it is the thing itself that you are enjoying. To test it, you can try giving that thing to someone your age and see if they enjoy it (they will most likely think it's a nuisance). To experience it yourself, you can try what kids are into these days or even better try something that people used to like long before you were born, in which case you will very likely see these things as pointless quite quickly. If you observe these things, it is easy to see that nostalgia is enjoyable because it is about associating your youth and naiveté with the object of nostalgia. If you grew up, you would see that it is just some distraction that merchants brought to you to profit from your stupidity. If you realize this, you'll enjoy not having to deal with that shit a lot more.