Ah but, Sqad, in the UK it was only the current REALLY OLD "older generation" which did National Service. JNO's point is perfectly valid.
It ended in 1961 and – given that it lasted two years – the final entrants went in in 1959. One had to be 18 to be called up so one’s date of birth must have been in 1941 or earlier. That means all surviving British ex-National Servicemen are 78 or older now.
That makes them the “REALLY OLD older generation”, as stated above.
President Macron, for example, would have missed it, had he been British and he’s the one responsible for reintroducing it in France. In any case, the link material makes it plain that it will be more of a scout camp than anything else. Hardly, what I and others had to face in Britain!