For example, when someone 40 years old use a cream and reduces some wrinkles, show that our bodies wants to reverse aging.
So, why not aging is a disease we all have? animals also?
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sorry, i know this isnt an answer, but that is really interesting! never thought about it like that before 
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It's all about what we put in our bodies, sun exposure, and emotional expression.
No the scientific definition of a disease is any abnormal condition which adversely affects an organism. Aging is completely normal, so it's not a disease.