Hey @Therapist4u and @KellytheBelly
The "flag" came from your mail client. I assume you are using gmail or similar?
Most modern mail programs use learning algorithms to filter out spam. They flag "potentially dangerous" based on patterns - which includes recent activity - so that the recipient - a human being - can decide, instead of either rejecting the mail or placing the mail in the junk folder.
Unfortunately spammers always try to get around the spam filtering agents.
The message was not marked dangerous by AARP, and in this case might have merely triggered an alert based on rules Google and others don't reveal (obviously, because the spammers and scammers will try to outfox them)
If you look at the message header showing what email domain and sender it came from, you will see it's legitimate.
For more explanations, go here:
Most Common Gmail Spam Notifications
Gmail: “This Message Seems Dangerous”
In any case - never click on links that look suspicious
Hope this helps.
Stay safe.