More generations. Like new born, baby, toddler, preschooler, child, preteen, young teen, older teen, young adult, adult, middle age, older age, and very old.
I quite agree. How about when the sims get "very old", they can get dementia, bad gums and might have to go to the retirement home?
I also agree with the more diseases and was thinking that maybe we could have a range of mental illnesses, or personality disorders. I would really like to see a sociopath rather than a sim with low nice personality points.