Ever since the platform was changed (October last year) this is not possible.
Just create a new user ID - you have no content created, you have no followers/following, no legacy reputation which means you will lose nothing by getting a new ID.
Unless SAP launches a campaign to send chocolate cookies to everyone who signed up 5+ years ago, this will have really low and purely sentimental value.
I'm sorry but I must disagree with the idea that you will loose nothing. Some people (myself included) have access to numerous resources tied to the P number. If i create another user ID I will loose access to those resources and access is not easily restored.
The issue of changing an email address associated with a P identity has existed for a number of years and consistently been ignored by SAP, which is dissapointing to say the least.
I agree that if you used the same account to register for trials this can be a pain.
However, for the user who originally asked the question this did not seem to be the case (and he never responded, so we cannot know why he asked about it in the first place).
In your case it seems that the situation is different (I assume that you do not refer only to SAP Community content).
I think that it should be rare to lose control over your personal e-mail address - this happened to me just once in the last 20 years (the company where I registered stopped providing mail service). Maybe because SAP assumed that people do not change their mail addresses very often that this is be the easiest way to identify a user.
I cannot say that I agree with this, I have raised my concerns about the concept in the past.
I guess that if you access trial accounts etc. with your P-userID that you could try e-mailing the support team and ask if they can change the e-mail assignment on their end.
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