Aging is nasty and sometimes (hell, most of the times) unfair.

Here is a system that might make it a little less cruel.

for each 10k that the player costs add 1 point. For av 9 add 1 point, av 8 2 points, av 7 3 points etc. Now the more points you have the less likely the player is to age. For big guys subtract 3 points. The cost is assuming a more sophisticated player that will take better care of his body and be less likely to age (seems logical to me). For av 7 and 6 is just a pure balance issue vs higher av teams.

For the first skill add 4 points, second skill add 2 point third skill 0 points, 4th skill -2 point, 5th skill -4 points 6th skill -6 points 7th skill -8 points.

For every 25 games a player has played -1 point.

A wardancer has 15 points, a zombie 5 points. The system could be like this: Roll 2 dice, if the result is greater than the total number of points then the player ages.

Halving movement and armor, the highest stat is the most likely to suffer. A wardancer will then have 4 3 4 3,5 so movement or agility will have a better chance of getting -1 than str or armor, there is not much difficulty in building a table based on 2 dice for this. Niggling will be entirely excluded from aging. And a simple MNG is the most likely result from an aging roll.

Additional rule: Roll for aging after 50 games a player has played and then every 15 games after that. After the 80 games mark, roll for aging every 10 games. After the 100 game mark roll for aging every 5 games.