I do not agree that there is a "negative light," and if you add "site:(source)" and search reliable sources, I'm sure you will feel even less "connotation."  Again, I am asking for an off-Wiki discussion of the language itself, anything from any reliable source saying "the format [x] years [y]'s [junior/senior]" is loaded or improper.  I simply posit that its neutral, widespread use both on-Wiki and in external reliable sources makes the "loaded" argument seem to badly lack backing. vivi