I believe the age of a Mistress has very little to do with trust.
I'd much rather trust a 24 y.o. who's been mentored properly by a reputable Domme. Especially if she's been doing sessions since she was 21. Far more than a 38 y.o. who has great internet presence but no training or experience.

I know some young Dommes that can really play!
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Truth is everybody is going to hurt you: you just gotta find the ones worth suffering for.