Bravo 3 Bellows question

[Baby Blue]

1998 2800 scr with 7.4 carbed bravo 3 drive.
Looking to replace all the bellows, gimbal bearing, trim senders, lower shift cable, impeller, etc this spring
3 year we've owned this boat and was curious how long we could expect the bellows to last or at what point it's recommended to replace them.
Fresh water boat and stored with drive down.
thanks, BB

[mmwjr]

Replace every 5 years however I have seen them last 10 years.

Inspect between the folds for crack also stiffness of the rubber.

[Speakrdude]

Store drives in the lowered position, if you didn't already practice that.