My awesome parents will celebrate their 55th wedding anniversary in July. The stuff they have lived through...always as a team...made them rockfuckingsolid. Oh, they still drive each other crazy with little shit, but they talk about it and still actually stop doing whatever is annoying the other one if they are not comitted to it (ex. my dad has diabetes but chooses to still eat crappy carbs, this drives my mom nutty but she knows he isn't going to change. I think she likes being able to complain about something he does because all in all he's pretty flipping great.)
TLDR...this marriage thing can actually work for some people, but it ain't for the faint of heart.