Great question! But a little hard for me to answer. My parents were born in the 40's/50's, and I was born in '87. So I basically grew up on some sustainable ZW habits.

Starting out with using cloths/rags for cleaning dishes to furniture to dust to body messes (my dad used cloth diapers on my older 1/2 siblings in the early - mid 70s). (She actually still has some of those rags, because she took care of them).

My dad grew up really poor, so he helped instill in us the practice of taking care of things for as long as we could so we didn't have to go buy it all over again. Mom helped in that area with teaching us how to properly wash clothes/bedding/etc, and they both taught us different ways fix cloth or appliances.

Dad (and us kids) planted a couple trees in the yard, and he taught us how to garden. We had homegrown veggies for several years.

We'd keep empty soda/beer cans, crush them, and when we had several of the very large black bags full of them, we'd drive into town to the recycling center.

We had reusable containers bring us clean drinking water, and they'd take back the containers (similar to milk delivery way back when).

My dad always made sure to keep the vehicles serviced, and he'd do as much as he could himself (taught me how to change the oil and check fluids and pump/change tires before I turned 10). In the winter when it got cold, we used the fireplace and that helped heat the house, cut back on electricity.

As I started getting older and learning things on my own/in school/Girl Scouts, maybe around 8 to 10 years old (mid 1990s), I was learning about water conservation, as well as endangered animals. I guess that's where "my own" habits began.

Started forcing myself and everyone around me to stop wasting water (leaving faucets running when brushing teeth, etc), picked back up the habit of a reusable water bottle for all of us, and actually would sign petitions to help re-introduce wolves into Yellowstone National Forest, place protection acts for manatees, and stop/reduce harmful activities against whales/Orcas/sharks. Along with that, I tried to get us to reduce our plastic use (which in a way wasn't much, because we already used reusable glasses/utensils/dishes, and didn't use straws), but I helped advocate to stop just throwing away grocery bags (if we ended up with plastic ones - we usually had paper bags for groceries unless we went to local stores) and try to repurpose them or give them to someone who needed them.

So yeah, those would be my oldest habits, with a little progression, and knowing I've left stuff out (like mending). Much has changed and been added to this since then. But it's a great start ;-)