It seems very odd now that, in the days when schools had cadet corps (only for boys, of course), it was quite commonplace to see school boys - how old? 14 to 17? - carrying .303 rifles to school. It was as unremarkable as them carrying school bags.
It also seems piquant that blue hair was the prerogative of many mature and very respectable ladies.
When I was a child I sometimes heard the comment mutton dressed as lamb. I was unsure what it meant, but it obviously suggested poor judgement and possibly questionable morals. Dyeing greying hair a more youthful shade definitely fell into this category.
Hooray for nowadays!