DD1 is insisting that Adopt Me is suddenly locked to those with a under 13 profile (she's at her grandparents at the moment so I can't check myself easily). We've had numerous instances of her trying desperately to push to get the 13+ lock taken off her account and so I am a little cynical on this one and won't do anything until she gets back home and I see it with my own eyes.
Can you ask your kids if they've changed the age rating on it- I got a wonderfully written email attempt at persuasive writing trying to persuade me to give her the password to the parental controls and I like to know the full situation before I act.