We recommend you inspect both your soffits and fascia every six months to decide if they need to be replaced. If you clean your roof gutters every six months, you can check your soffits at the same time. Put it on your calendar, or set a reminder on your smartphone.
Soffits may need to be replaced if you see:
Fungus, algae, or mold
Signs of wood rot
Soffits that are sagging or cracked
Chipped paint (which can let water in)
Missing soffits
Points where animals have gnawed on them