“…Most studies relating age to generosity (e.g. Bar-Tal, Raviv & Leiser, 1980;Chapman, Zahn-Waxler, Cooperman & Iannotti, 1987;Midlarsky & Hannah, 1985;Simons & Zumpf, 1986) have documented age trends in children's prosocial behaviour, at least during the latter half of the first decade of life. In other words, there is considerable evidence that 'altruism increases with age' (Krebs, 1970, p. 290), with 'older children sharing more often and more generously than younger ones' (Underwood & Moore, 1982, p. 27).…”