Is a chap 17 years and 364 days old, an irresponsible teen ager with raging hormones, a punk unfit to enter contracts, vote, or much else, except drive and watch R rated movies, or enter the armed services, but with the elapse of one day, a mature and composed and sensible adult, fit for all the responsibilities of adult life, except booze?
The chap could have joined the armed forces 364 days ago and any chap wearing a uniform is old enough to have a beer, wouldn't you think?