But they didn't die.They went into the past and lived into their 80's.
...and then they died. Having lived the majority of their lives in another country (presumably), in their past
, without their families and friends, their daughter (rarely as they ever mentioned her) or the Doctor.
For me, that isn't an entirely positive scenario. They had each other (which I really like - I'd envisioned one or the other dying and the other living miserably ever after so this was something of a plus), but they lost pretty much everything else. And regardless of timey wimey wibbly wobbly stuff, they're effectively gone for good. The Doctor made it clear he'd never see them again and I'd be surprised if that didn't apply to River as well (never mind everyone else). So...yeah. Not happy, Jan. But as ever, to each their own.