After which age, humans stop acquiring new reasoning?
For instance, suppose Mr. 'X' believes that
- capitalism is good, communism is evil or vice versa
- a specific religion is good, all other religions are evil
- a specific political party is good, all other parties are evil
- ... etc.
these are examples of beliefs. People generally don't change their beliefs.
If I want to change his belief, when should I stop trying? I mean, can I change his belief if he/she crossed 40years?