I’ve got one that is at least 34 years old. It’s an art quilt that I pieced with both traditional blocks and 3 dimensional blocks, then sandwiched, but due to time constraints (it was due to be shown at an art gallery), I did not finish the quilting, just did some tacking here and there and used a temporary binding to hold it together for the show and sent it off intending to finish it when it came back. That would have been in lthe fall of either 1981, 1982 or 1983.....
Rob