Yes. The teller, that I had befriend would call me anytime she had something in. She had about 15 $20.00's GEM CU that were overprinted about a 1/2Rev to Obv, and was from very dark to very light with consecutive numbers. Later I got 50 CU $10.00 connectives stars notes of series, 2001 or 2003, and two weeks later about the same amount, but it was the news series of 2004A Stars. So, it's important to know your tellers.
From what I know, I swear I remember somebody having a 1963 $1 FRN at one point and a 1995 $10 FRN too. I also remember seeing a 1985 $5, but that hasn't occurred in years.
In 2000 I received a $1.00 North Africa note in change from a coin dealers shop. It was pretty beat. I suspect it came in a group of things he bought and he put it in the till.
I got several 1928 $5.00 U.S. notes from the casino I work at. That's the oldest date that so far I've found in circulation.
I can't get to the bags full of Kennedy half dollars. The cage counts all they get that come in (all are from customers ) I asked a cage girl if she was sure about that and she said "we don't order this half dollar "sh...t". They put them in machines to be counted and bagged automatically. I did ask the cage manager once if I could buy a bag from the casino. She said it would be near impossible to get clearance to do that. Besides that she thought I was nuts. I have found a couple of SLQ's and Washingtons, steel pennies, wheaties, some foreign coinage and most of all, old currency. Each bag can hold about $575.00 in Kennedy Halves.
Is the question "you find" as in your original post or "you found" as many are replying? One is the present tense, the other is the past tense. They can have totally different answer's. Currently I find the 2003 series as being an older bill in current circulation. Back around the 1950's, I found a couple of 1929 Federal Reserve Notes still in use. They really jumped out at you when presented as change. Someone posted that they received one out of an ATM machine lately. That was most unusual.
In circulation? A ten dollar bill from 1989 is the oldest I've got... I don't focus on US currency though.
When I was about 15 or so years old, I'm 70 now. It was a national currency. I guess I spent it. but I will always remember finding a national in change.
I found a 1963A $1 in my change about a month ago, and I found two 1928D $2 at my bank about a month before that!
A few months before I started collecting currency I had a customer pay with a 1934A $20 bill. I seriously regret not taking it.