The lecture by Professor David Halpern discusses the impact of behavioral insights on health, wealth, and happiness as people age, referencing Daniel Kahneman's two systems of behavior. It highlights the potential for improving health and extending life through changes in behavior, while also addressing the relationship between income and well-being, as well as the effect of societal loneliness and inequalities in happiness among older populations. The findings underscore the importance of addressing environmental and behavioral factors to enhance quality of life in later years.