Your basic characteristics, preferences are inherent and therefore more or less stable.
However, an individual’s personality profile develops over a person’s life span.
Since personality relates in part to our physical appearance, abilities, intelligence and the maturation process, nature or genetics play a role.
Likewise, since personality is developed as a result of our experiences in our environment, the experiences we have will influence the development of our personality.
Both genetics and learning play a role. The extent to which learning contributes is the extent to which personality is subject to change.
Like all learning, changes are more noticeable in the very young and less so in older adults.
Only in exceptional cases, for example if a person undergoes any traumatic experience, his/her personality profile may change.