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I am something people love or hate.

I change people's appearances and thoughts.

If a person takes care of themselves I will go up even higher.

To some people I will fool them. To others I am a mystery.

Some people might want to try and hide me but I will show.

No matter how hard people try I will never go down.

What am I?

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I think you are

Age

I am something people love or hate.

People tend to love or hate their own age depending on how old they are.

I change peoples appearances and thoughts.

People's appearances and thoughts change as they age.

If a person takes care of them self I will go up even higher.

People live longer if they take care of themselves.

To some people I will fool them.To others I am a mystery.

Some people do not look their age, some people do not know how old they are.

Some people might want to try and hide me but I will show.

Some people try to hide their age using cosmetic methods but eventually it will show.

No matter how hard people try I will Never go down.

Age only increases with time.

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