Showed this in a big way. We compared the ages we derive with our latest models to those from other people's single star models. The results were significant to say the least. In this plot we plot BPASS ages vs single-star
Anyway what all got me into this game in the first place was trying to reproduce the number of hydrogen rich to hydrogen free supernovae. You can only reproduce the observed rate if you have lots of binary stars. About 1 single star for 1 binary.
Btw the colours coding here is surface hydrogen abundance, red=none. So note the agreement isn't perfect.