Immortal 
To dream of being immortal connotes longevity, permanence, or fearlessness. You believe that you are stronger and mightier than others. Alternatively, it signifies unwillingness in starting anew or resistance in redirecting your plans. You are reluctant in embracing change.
Afterlife
Dreaming about an afterlife suggests a desire to know what your future holds. This doesn't necessarily have to mean after death, but can also be applied to the present.
Alternatively, dreams of an afterlife can be deeply religious or an indication that you have recently changed your beliefs.
An afterlife may also symbolize a recent loss of someone close in your waking life.
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