I’m not saying I don’t want to believe this latest research on what makes hair turn grey…but I know that I have literally felt it happening and stress hormones have to be involved in there somewhere.
In my late 20’s I could feel it happen every time I drove on the M25 and since having twins…well every bedtime.
https://www.theguardian.com/science/2023/apr/19/scientists-may-have-discovered-why-hair-turns-grey