On Lioden, Lions begin to risk death around 14-15 years, with a definite death at 16. However, a real lion can live up to 20 years, and lions in captivity can live past that: 25 years. The only reason they get up to 10-14 is due to starvation, death via others lions, ect. -- it is VERY rare a wild lion dies from age.

Which is why I'm asking Lioden...what do you say to getting an extra 4 years/48 days out of your kings and ladies?

However, as a regulatory measure...
-Cubs sired or mothered by a lion pass the age of 16 would suffer stat penalties. This is true to life of men and women producing less-than-healthy/mutated children due to advanced age. However, the chance of mutation would also rise.
-A lion pass the age of 16 depletes energy at a faster rate than younger lions. Certain personalities (such as hyperactive) may counteract this.
-Females pass the age of 16 would run the risk of dying on a hunt if sent out.
-Fertility (and it's loss) is different for every lioness. Goddess lionesses would stay fertile throughout their lives regardless of age. High lionesses have a 50% chance of losing their fertility. Good and Avg ferts stay as they are. Low and VLF lionesses lose their fertility earlier than normal.
-16+ females have a chance of dying in cub-birth, particularly if their stamina stat is low. Death in childbirth may take the cubs with them in 50% of cases. If cubs don't die, the player is given the chance to get rid of them or append them a lioness who is already mothering cubs of a similar age. (No more than a 2 month age difference).
-On RollOver, the player has a chance of receiving the message that their male, if 16+ in age, was killed by a younger, stronger rogue. This possibility starts at 10% and then grows 2% each Rollover. If there are submales that exist in the pride, the possibility is counteracted. For example, if my male was 18 years old, the chance of him being killed by a rogue is 58% because 24 days have passed. However, every submale I had would take off of that overall number, (7% for adult males, 2% for adolescent males). If I had, say, 5 adult submales and 4 adolescent submales that 58% would be brought down to 5% because of the joint effort of adults and subs would = 48%. Players would receive an achievement upon successfully getting a male to 20 years of age. If a lion dies while there are submales present, the heir gets a skill or smarts boost.
-Submales can also gain stats from unsuccessful rogue attacks on the main male. These, too, increase as the male ages. Failed Rogue Attacks boost the stats of whichever male(s) chased the intruder off (which would be chosen at random). The more rogues there are, the more stats there are to gain, but the higher your main male's chances of being killed.
- There are different types of rogues:
Young Rogues (50-100 stats-- very common),
Average Rogues (100-300 stats-- common),
Considerable Rogues (250-500-- uncommon),
Dangerous Rogues (500-800 stats-- uncommon),
Deadly Rogues (800-1000 stats-- seldom),
Usurpers (2000+--rare).

The older your male gets, the higher the chance your submales will have the deal with the more dangerous rogue types.
- It is possible for your submales to LOSE against a rogue but drive him away too. If this happens, that males defense bonus that he offers to the king will be halved. For example, an adult offers 7%. If he lost a prior fight, it is lessened to 3.5%.
-If a male is killed by a rogue and no submales exist, unprotected cubs are automatically killed. Their mother's breeding cooldown is cut by half.
-If a male is killed by a rogue but his personality is either vicious, bold, or protective, he will kill the rogue as well. Dead rogues have a chance of dropping Lion Meat (%5), Lion Scrotums (1%), Flesh of the Unworthy (30%), or Lions Skulls (64%).

Please note that playing past 16 years is an entirely optional experience and you can retire your male for free at anytime if you choose to do so!

If the above suggestions seem harsh, it's because they're supposed to be! But, you don't have to partake in advanced lion liodening if you don't wish to! :D

Thoughts? Questions! Suggested Changes? I'm all ears!