The first teeth you get immediately after birth just like you get your first opinions from your parents and social environment. Later in life you develop your own opinions just like you lose your original teeth (called milk teeth) and develop more permanent ones that are probably gonna last you a lifetime.
Opinions should not be set in stone since adulthood; that’s how you get old people who are set in their ways and opposed to progression. Opinions should be open to change throughout your entire life
Opinions should be like shark teeth. Always open to replacement.
I think you should strive to change at least one opinion a day.