When to replace water hoses?

[Lovenwlink]

Probably a stupid question, but...
I am having some water in the bilge issues, its a 1998 Super sport GT 40 about 850 hours, I have identified one leak from the fresh water cooling hose that needs to be replaced. I also noticed water dripping from the 4" exhaust hose at the muffler, when I tightened the hose clamps it leaked more I moved them around a little to try to adjust and re-tightened (closer to the end of the hose) it continues to drip water.
Is it just time to replace the hose? Do they "wear out" where you cannot seal them?
Just put the boat in for the season and it is on whips, planning on putting it on a lift to change out the fresh water hose.

Thanks

[High altitude]

When they get old, they lose their elasticity. When that happenes they tend to not seal well. It's time to replace when you can no longer get a seal. For the hose between the impeller and the top of the engine block (thermostat housing) I used a clear hose I got from wakemakers. It is so nice to visually inspect for water flow versus guessing if water is making it to the block. Just a suggestion (and only use it for cold water). -Marc

[shag]

I would def replace the hoses. Good idea High altitude!