I got my "day old" Khaki Campbells on May 4th, making them around 3ish weeks old (however, I really think they are older than 3 weeks old.) They are outdoors full time, now, and LOVING the warm weather and freedom they have to run around!! Their pen has a dirt floor with Rosewood horse bedding (wood shavings) on top, we're doing deep litter method in there. They free range in our yard (with our supervision) once a day or so. Do they need supplemental grit and if so, for how long?