While this may not be the most effective solution, as of right now, the best way fix this is to readjust your age on your Microsoft profile to one that’s way past 18 despite being 18+. It seems to have worked for me.
Age Verify on Copilot
Merrick Smart
50
Reputation points
Ever since the new update I am unable to sign into copilot.
It keeps asking me to verify my age and every time I do it doesn't update (I am also above the age of 18). There is no option to go back to copilot after verifying age.
Nor does the new copilot reference sources like it used to.