Board Thread:General Discussion/@comment-34987027-20180605194730/@comment-4010415-20180605212145

The "has to be young" thing only applies to receiving the powers.

In a Q&A, they said that the age at which a woman can no longer receive Maiden powers is approximately 30 years old. So, up until she's 30, a woman can receive Maiden powers, and even after she's 30, she gets to keep them until she dies.

Basically, there's no age limit for having the powers, just receiving them.