The study of aging and the aged. divides groups up into young aged (65-75) middle aged (75-85) and elder aged (85+).
A variety of topics are focused on, including living conditions, mental ans physical health (everyday tasks being performe). And even sexuallity (for reference watch "Sitll Doing It:The Intimate Lives of Women Over 65"). And a side note, although much of the elder population thinks they suffer from alzheimer's disease only about 3-5% do. Your long term memory actuallcy increases as you get older, it is you short term memory that decreases.