As others have said, no need to replace if they are all in good shape.
You don’t mention if you are replacing with composite or wood, but if the plan is to use composite and the existing joists are 16” OC, then you will want to consider adding additional joists to better support the composite boards.
Bernadette__ t1_ja6pzab wrote
Reply to Do I need to replace my deck joists? by RobotKevinSpacey
As others have said, no need to replace if they are all in good shape.
You don’t mention if you are replacing with composite or wood, but if the plan is to use composite and the existing joists are 16” OC, then you will want to consider adding additional joists to better support the composite boards.