Meanwhile, I've been at the same company for longer than a couple of my coworkers have been alive (though I've changed jobs twice in that time) so "only five years" sounds comparatively short to me.
Meanwhile I've been at 4 startups, from seed to Series B . I just get bored so easy.. after 3 or so years I NEED a change. Or maybe is because startups dont care about w/l balance and drain you until you quit.