Mac Donald's... Your first how old were you... Do you remember it? Was it a right of passage?

I remember hearing about them in the 60s from friends who had been to the US on holiday and were struck by the ubiquity of the 'golden arches'. I can't remember exactly when I actually ate anything from them, but I must have been in my mid-20s. Never a favourite place, but I found on mainland Europe they had salads so were acceptable on hot days when I didn't want to eat a full meal. I do like their milkshakes. The burgers are to be avoided.