Humans hit middle age in game at 35. They hit venerable at 70. With max rolls they can live another 40 years. This means they can exist in the venerable state for a max of 36% of total lifespan. And they hit middle age 31.8% of the way through their total lifespan.
Elves hit middle age at 175, venerable at 350, and can live up to 750 years. Thus they can exist in a venerable state for 53% of their lifespan.....and hit middle age at a meagre 23% of the way through their total lifespan. That's weaksauce.
Just fix the aging chart. Make middle age around 240 years, and venerable around 480. Make maximum age 480+3d100. That would fix the problem.
Banshee
You keep saying there is a problem. Where is the problem? What exactly is weaksauce about being venerable for a long time?