Some grown-ups hate to throw out old things because they have sentimental value. For example, clothes might remind them of a special event or a loved one. Throwing these items away can feel like losing a piece of their past. This emotional attachment makes it really hard for them to let go of these things.

Grown-ups sometimes keep old things because they think they might need them later. For instance, old clothes can be turned into rags or used for sewing projects. This mindset of "waste not, want not" makes them hold onto items, thinking they could be useful in the future.

Some grown-ups are concerned about the environment, so they don't like throwing things away. They prefer to recycle or donate items instead of adding to landfills. This desire to live sustainably makes them hold onto old things until they find a better way to dispose of them.

Financial considerations can also make grown-ups hesitant to throw away old things. They might see value in items that were expensive and don't want to waste money by discarding them. Some believe these items could have resale value, so they keep them as a way to conserve resources.