At what age do you start adding soy sauce, salt, sugar etc into your kids food?

My son is 27 months old and we haven't added them into his food yet, but he does unavoidably have them in outside food sometimes! I personally feel that they have the next 70-80++ years of their lives to enjoy whatever flavourful food they want, it's more of my responsibility as his mother to try to give him a good and healthy foundation to start :) I do know of parents who have given biscuits, cookies and ice cream etc on a regular basis way before us (my son only had a one-off bite/lick), and there's no right or wrong in this - it all boils down to your comfort level!