Ever changing.
I think that people change daily. Every day is the opportunity to take in something new, to learn from someone and to open yourself up to something that could change your opinion on life, love friendship or yourself.
Look back to when you were in high school, are you the same person? No, you're not. You learned new things and as you venture out on your own and take in new experiences you learn about yourself.
When someone says they are who they are, people don't change, i think that's unrealistic and unfair. People have habits, people are taught things and they learn things and habits can be broken if you don't like them. You can change if you want it bad enough and if you're not happy with yourself then it should be your right to become a person that you like and are happy with without people telling you that it's not possible to change.
Not everyone has the will to but everyone should be given the opportunity to.