Procyon A is weird. Despite being 1.478-1.5ish solar masses, it is already appears to be in the subgiant phase despite models predicting a 1.5 solar mass F-type star to have a lifetime of 3.75 billion years, yet estimates put Procyon A as being less than 2 billion years old. Assuming the model is correct, it would need to be closer to 1.9 solar masses initially and have shed about 0.5 solar masses to get to where it is now.