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At most you might have to flush the fluid and replace it. Can't hurt after a couple of seasons.
I'd only worry about replacing a line if it damaged, but that's pretty unlikely on your bike with internal routing.
Because of this the only time you need to do anything is when the fluid shows obvious contamination from parts wear or a little water has made it's way past the caliper seals.
Hose itself is fine - I will replace it because I've had to chop the olives off and its short, but I wouldn't worry about doing it as routine - if its not leaking then I'd just leave as is.