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Let me add a welcome message to new posters, which is removed after a period of time

I love seeing new users ask great questions, and I try to be as friendly as possible to these newbies as I still feel like one of them! I'm aware that friendly welcome messages are "off topic" for strict Q&A, so I worry about adding them to my answers

So, my suggestion would be for the ability to add a friendly welcome to new users, which then drops off from the answer after a period of time, so when this answer is viewed after a long period of time it's stripped down to the clean-cut answer, sans friendliness!

How do you all feel it is best to be friendly and welcoming, while not cluttering up questions/answers?