Four-year-old's And Bathing

Why does a four-year-old need more toys than bubbles while bathing? I could also ask, Why does a sixty-year-old lay down in a tub of hot water and fall asleep? I guess it's the nature of the age. A four-year-old has pent up energy needing an outlet, whereas, a sixty-year-old has pent up lethargy needing relaxation.