I did this some time ago, put all aging (and anti-aging) effects over to what I call Human-Year Equivalent (HYE) as based on one's normal natural lifespan; thus if a Human goes from 1-100 and an Elf goes from 1-800 a Haste hits an Elf for 8 years instead of 1. This also makes it more fair to the Part-Orcs, who otherwise got really hosed on this stuff with their shorter natural lifespans.Stormonu said:Negative drawbacks for casting spells - ... - haste's aging (but as a % of natural lifespan, so elves and dwarves don't laugh at the humans as they only lose a year off their lives).
I want to add that I liked this, too.* Less reliable spellcasting. Casting time and spell interruption make things much more interesting.
Speed of play.
The possibility of mixed-level parties.
The possibility of any level party fighting a wide range of monster levels.
Random prostitute tables.
Erol Otus (read: Sense of Wonder).
Quick character generation.
A lack of massive numbers inflation.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.