[Solved] Bach Flowers expiration date?

Hi Ernst and group, I remember in the course you said the remedies continue to work even if the bottle had an expired date.

I have some bottles from 2017, I wonder if you meant, they never expire or they're ok for 3-5 years. I've kept them well, tucked in the dark, in cool-ish temp. 

The bottles I have are from the "official" brand with alc: 27% vol 

I've read different things online...

Thanks for the clarification!