Society & Culture - 106 free documentaries about ageing & death.
Start with How to Slow Aging (and even reverse it) (21 min, Veritasium), then Louis Theroux: Inside America's Largest Dementia Capital (59 min, Real Stories). All 106 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on ageing & death is Being Mortal by Atul Gawande.