Why cats become less clingy as they grow up:
1. They become more independent. As cats grow older, they develop the ability to think independently. Cats are naturally solitary animals, and once they mature, they no longer need to rely on their owners.
2. They start to hold grudges. As cats grow older, they become less easily fooled than when they were kittens. Hitting a cat might leave a lasting impression.
3. Territoriality. When a cat is young, you are its provider. But as the cat grows up, you become its "slave." In a cat's world, every area of the house is its territory, and you are merely a "resident." 
Factors contributing to a kitten's clinginess:
1. Too small. Some kittens may seem very clingy when they are young, but this is actually because their bodies are not yet fully developed and they cannot break free from their owners' "restraints".
2. Physiological needs. Kittens need food and warmth to survive when they are very young. If the mother and father cats are still alive, they will definitely be very dependent on their parents and will be very clingy to them.
3. Psychological needs. Kittens are not fully developed physically or mentally, and when they are very young, they can only rely on their owners. Many kittens long for someone to take care of them.
4. Personality issues. Different cats have different personalities. Some cats don't like to be clingy with their owners, whether they are kittens or adults.
