I hate this business of pitting generation against generation.
My parents are both dead but would be almost 100 if still alive. They were brought up in the war and never wasted anything, especially not food.
As for my husband and I (I'm in my 60s, he's in his 70s), I think we do pretty well.
We have solar panels.
We drive an 18 year old car (which we will soon be replacing with a plug-in hybrid). We walk when we can. All our working lives we commuted to work by public transport and our children went to school by public transport from the age of 11. We haven't flown anywhere since 2016.
We recycle everything we can. We fill less than 1 normal bin bag with rubbish every fortnight. We have virtually no food waste (peelings etc go in the compost).
We use the "eco" settings on the washing machine and dishwasher and use the tumble dryer only for towels and in the winter/when it's raining. We have a water butt to conserve water.
We don't buy fast fashion. We expect clothes, household items and furnishings to last.
No doubt we could do more. We eat meat - though usually only 2 or 3 times a week (plus fish) and I always buy it from a butcher rather than a supermarket.
We had children, but only two and quite late in life. I used disposable nappies (and wish now that I had persisted with the washable ones I started off with).
As for heating, well yes, we have it on in the winter, but never in the summer. When our boiler goes, we will replace it with a heat pump.
In summary, there are people of every generation who try to do what they can. There are people of every generation who can't be bothered. Most of us are somewhere in between.