I'm only considering those 3.5's I've shot. Of all of them, only 1 had I seen before and it was that same week. They were rutting hard. I saw him a couple times that week but I figure it was only due to about a 1000 acres of corn being cut down to 2 acres in front of my stand. All the deer were in that corn field.
Other than that one, all the other 3.5 year olds I saw only the day I shot them. One 4.5 year old or older came in one time and one time only.
I've seen the 2.5 year olds a couple times and 1.5 year olds multiple times.