Is there a cut-off of sorts for what 'younger' is?
In general, if you're born in the same year as your friend you can drop the "hyung/oppa/unnie/nuna" honorifics, which is why Jaejoong and Yunho are peers. And technically Yoochun and Junsu are their peers as well so I'm not sure why they consider otherwise? I'm thinking it could be either because:
1) Jaejoong and Yunho entered school a year earlier - in that case, grade level overrides actual age, so anyone born in 1986 but who's a grade below them would have to call them hyung. 2) Jaejoong and Yunho count their age by the lunar calendar. If their birthdays fall before the Chinese New Year, they're technically born in the previous year compared to Yoochun and Junsu. This is sort of age-counting is not common but maybe DBSK wanted to be super-traditional or something...
BTW if you ever find out the real reason, do let me know as I'm curious too. ;)
what's the terminology for when a couple gets married then? Would a wife still call her husband oppa?
Wives can still call their husbands "oppa" (if the husband is older, of course) but that's more common among young newlyweds. When couples get into their 30s, "oppa" becomes too awkward/childish-sounding, so they usually call each other 여보* ("yeo-boh" means "dear" but more neutral than affectionate) or 자기야* ("ja-gi-yah" means "honey" or "darling") among a bunch of other nicknames.
*used only to directly address your spouse; one cannot say "Jaejoong is my 여보".
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In general, if you're born in the same year as your friend you can drop the "hyung/oppa/unnie/nuna" honorifics, which is why Jaejoong and Yunho are peers. And technically Yoochun and Junsu are their peers as well so I'm not sure why they consider otherwise? I'm thinking it could be either because:
1) Jaejoong and Yunho entered school a year earlier - in that case, grade level overrides actual age, so anyone born in 1986 but who's a grade below them would have to call them hyung.
2) Jaejoong and Yunho count their age by the lunar calendar. If their birthdays fall before the Chinese New Year, they're technically born in the previous year compared to Yoochun and Junsu. This is sort of age-counting is not common but maybe DBSK wanted to be super-traditional or something...
BTW if you ever find out the real reason, do let me know as I'm curious too. ;)
what's the terminology for when a couple gets married then? Would a wife still call her husband oppa?
Wives can still call their husbands "oppa" (if the husband is older, of course) but that's more common among young newlyweds. When couples get into their 30s, "oppa" becomes too awkward/childish-sounding, so they usually call each other 여보* ("yeo-boh" means "dear" but more neutral than affectionate) or 자기야* ("ja-gi-yah" means "honey" or "darling") among a bunch of other nicknames.
*used only to directly address your spouse; one cannot say "Jaejoong is my 여보".