Yeah, while there certainly is an overwhelming imbalance in experience and power, there is enough evidence that he wouldn't abuse it: the way the whole town they live near trusts him, the animals trust him, and he seems to be a role model for the peacekeeping mages despite not being part of their organization.Age gaps are less about the number and more about the imbalance of experience and power (that comes from being more experienced and/or accomplished); sometimes it's about being at different stages of life and anticipating a conflict arising from that. And since it seems like the two of them are on the same page, the gap of a few millennia shouldn't make too much of a difference.
Yeah, while there certainly is an overwhelming imbalance in experience and power, there is enough evidence that he wouldn't abuse it: the way the whole town they live near trusts him, the animals trust him, and he seems to be a role model for the peacekeeping mages despite not being part of their organization.