There are two options here:
1: Everything happened as they were chronologically presented on screen. And remember, both No and Georgiou Never Dies perfectly place the stories in time, as No could have only happened during the space race and TND could have only happened during the media blitz of the late 90s/early 2000s.
I'll even concede DAD was his last mission and he retired in his late 60s (however improbable that is) That means he would have had to have joined MI6 in his late 20s. Or 30 at the very latest. That means he would have had to become a prominent submariner and worked his way up through RN intelligence and the SIS before that - only to spend the next four decades embarking on one crazy adventure after another (at a pace of almost two a year).
2: They're all reboots.
1: Everything happened as they were chronologically presented on screen. And remember, both No and Georgiou Never Dies perfectly place the stories in time, as No could have only happened during the space race and TND could have only happened during the media blitz of the late 90s/early 2000s.
I'll even concede DAD was his last mission and he retired in his late 60s (however improbable that is) That means he would have had to have joined MI6 in his late 20s. Or 30 at the very latest. That means he would have had to become a prominent submariner and worked his way up through RN intelligence and the SIS before that - only to spend the next four decades embarking on one crazy adventure after another (at a pace of almost two a year).
2: They're all reboots.