I've seen what you describe but then also can speak for myself that on my time off I'm awfully active. Building things physical and/or software, spending time outside, reading, etc. If I retired tomorrow I'd probably work just as much, if not more, because I'd work on my interests and not what I was assigned. This is common for the majority of adults I know.

I'd say I'm far from fully burnt out (we've all had our moments) but I think there is some career saturation point where people feel ownership over their free time and treat it with respect instead of "drinking/gaming".

Is wasting days off a symptom of youth? Is it because military employees lack autonomy? Is it just natural after years of selling your time to an employer?