Nothing required until we arrived in Spain, then we had to show our vaccination certificates for them to scan the QR code, then nothing at all for the rest of the holiday.
I had a similar experience in my 40's, I felt an injury whilst cycling. It turned out to be a torn cartilage, I had a minor knee op to tidy things up and haven't had a problem with it since.
It appears incredibly difficult at first to put them in and take them out but believe me with practice it becomes very easy. Persevere you will not be sorry.