> that these treatments would also rejuvenate the mind in some fashion, but that seems dubious.

This is of course included in that and we're already seeing some research into it. To prolong life itself isn't a goal if we can't keep healthy, and the brain is part of that.

If we slow down or reverse aging the brain won't deteriorate either. It's all about solving the root cause of why our bodies and mind fails us over time.