Virtually all citizens in the Solaris Republic benefit from advanced medicine and biotechnology, granting them freedom from disease and greatly extending their lifespans.
Most beings receive prenatal gene therapy and and regular, individualized care throughout the rest of their lives. These treatments repair damaged and aging tissue, destroy malignant cells, kill viruses and regulate body fat, among other things, allowing Republic citizens to enjoy long and healthy lives, free from senility or dementia. The average Human, for example, lives to 140 standard years and only begins feeling the effects of old age at around 80 years. Most Humans would be considered truly elderly at about 120 years.
In the Akaylan Empire, access to the best biotech is usually limited to the higher echelons of Imperial citizenry, though all but the poorest and most isolated citizens have access to medicine.