Same procedure as last year (more questions)

[Flop]

After receiving an email last week about the latest Dominions 3 patch, I remembered that I own the game, and that I haven't played for a long time.

Anyway, I'm hooked again, and I need help understanding stuff.

While reading through Baalz' excellent communion guide, I stumbled on this passage:

Masters spamming elemental attack spells want boosters, not for fatigue reduction, but for increased damage and/or area of effect. This is obviously true for most of them (note all the +s in the spell description) - what most people don't know is that the fatigue inflicted by the secondary wave (which is area 9!) from thunderstrike is also air-magic-dependant, so if you can push your air magic up higher it becomes much more devastating.

I didn't know that spell effects were increased by higher path levels, although I had noticed the pluses in some of the spell descriptions. I'm sure this must be documented somewhere, but I've failed to find it mentioned in the manual. Could someone please elaborate a bit on how this works, exactly?

Also, does anyone know if there's any way to remove old age from a character, besides the T'ien Ch'i national spells? I know how to stop aging, I'm talking about reversing it.

Thanks in advance.