The average protester has aged from 35 to 46 across two decades

Evidence

Confirming the “graying” of protest demonstrations shown in figure 45, Roper surveys found that the fraction of all self-proclaimed protesters who were forty-five and over doubled from 17 percent in 1978 to 32 percent in 1994. … These same surveys show, however, that the average age of all adults who had ever demonstrated rose steadily from thirty-five in 1974 to forty-six in 1995; the modal protester throughout this period was the aging veteran of the sixties. — Robert D. Putnam, Bowling Alone The Collapse and Revival…, 2073