Doubt it was that prep. I did have strange bracers for about 100 hours. That said, Lithodora still lasted longer than my other two human leaders. Kasir age died at 544 hours and Ageryn at 528.

To my knowledge, I never wore any +age gear with any of them.

Kasir was granted at 268 hours.
Ageryn was granted at 306 hours.
Lithodora was granted at 196 hours.

That probably explains why Lithodora lasted the longest of the three.