The short answer
The honest short answer: which hand? Traditions differ: the dominant hand for the present and the other for potential. Do the lines change? Yes, gradually, which palmists take as proof of plasticity and skeptics take as proof of everything else. Either way, the palm answers reflection questions better than live ones.
What palmistry can and cannot do
Within the tradition, line length and quality describe vitality and temperament, branches describe turns, and the mounts describe leanings. As a structured language for self-reflection it has survived thousands of years, in India and everywhere else.
It cannot tell you when you will die, how many marriages you will have, or whether a baby is coming: those are the carnival claims that made palmistry a joke to people who never met the serious version. And no palm reading can substitute for the decision in front of you.
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