Could any photons that were around me in my childhood still exist?

Could any of the photons that were around me when I played outside as a child decades ago still exist travelling through space?

Eric Kvaalen
Les Essarts-le-Roi, France

Yes. In fact, about half the photons that were reflected off you when you were outdoors went upwards. If they didn’t hit a cloud, most of those would have gone right through the atmosphere into outer space. Almost all of those still exist. A very small percentage hit the moon or the sun and came to an end. Far fewer hit planets or other solar system bodies. An even smaller number hit…