Focus on relevant characteristics. Age interacts with other characteristics of the individual.
Acknowledge relevant differences that do exist. Differences also exist among older adults. Be specific about comparisons, and prefer "older adults" to "othering" terms such as "seniors" and "the elderly," even if individuals use these terms themselves. Specific age ranges are preferred to "over 55."
Acknowledge people's humanity. "Dementia due to Alzheimer's disease" is preferable to "senile."