See Brother, Sister. All are different parts of self. According to Freud, this is very often a symbol for genitals. Older siblings, according to Jung, point to more developed parts...

1. When a brother or sister shows up, it indicates unre­solved conflicts with the person.2. Reflection of a good quality or qualities that one should incorporate in oneself. ...

To dream you are older than your actual years, indicates you should see a doctor - there may be a health problem....

God-Mind within ...

Guardian. ...