If you're comfortable inside your motor, and you're changing the belts yourself, and it
ain't nothing but a thang, only replace them if you think they need it.
I'm going to get a trustworthy mechanic who's not me to change my belts soon,
and I've got new tensioners for him to put in because the manual sez they are
wear parts to be checked, and I ain't going back in to check

...
-Mike