In today's lecture, we'll discuss the impact of urban green spaces on mental health. Recent studies have shown that access to parks and gardens can reduce stress levels significantly. However, the benefits are not equal for all age groups. For example, a 2021 study in London found that teenagers benefited most from active recreational areas, while older adults preferred quiet, shaded spots for relaxation. Interestingly, the study also revealed that the proximity of green spaces mattered more than their size for elderly residents, who were less likely to travel far. So, when designing future cities, planners should prioritize small, local green areas rather than large, distant parks.