Ronald McDonald was the McDonald's mascot used in the 1960s slogan “McDonald's is Your Kind of Place.”
The slogan appeared during the period when McDonald's was building a nationally recognizable family brand around Ronald and the developing McDonaldland cast. Ronald's clown identity gave the company a distinctive character who could appear in television commercials, restaurant promotions, and public events. The line framed McDonald's as a welcoming place rather than simply a fast-food outlet.
This question concerns a slogan association, not Ronald's debut date. Ronald first appeared in McDonald's advertising in 1963, while “McDonald's is Your Kind of Place” belongs to the company's later-1960s branding. It is also different from “You Deserve a Break Today,” introduced in 1971, and from “I'm Lovin' It,” introduced in 2003.