“…This interaction can only occur if children of mixed-ages are present, i. e., available. Indeed, children in mixed-age settings have been found to play more often with older peers than children in same-age settings (Urberg & Kaplan, 1986) where older peers are less available. Acknowledging the potential importance of availability, some studies have controlled for it in analyses of mixed-age interactions (e.g., Goldman, 1981Roopnarine, et al, 1992.…”