I think they're maybe between 1 1/2 and 2 weeks old? I got them on Saturday from the TSC bantam bin. They're my first chicks, so I'm not really great at guessing their actual age.
They would have hatched on Monday or Tuesday of that week (or possibly Wednesday, but that's less likely.)
Hatcheries follow a pretty consistent schedule, so the chicks get mailed early in the week and arrive before the weekend.
Based on the amount of feathers, they were less than a week old when you got them on that Saturday, not an extra week older.
So yes, they would be about 1 1/2 weeks old at the present time.