I am in my 50's. Like most of my friends despite being comfortable we don't buy stuff unless we need it, we recycle, we plan to minimise food waste, try to eat well etc.
What i see with young people is rampant consumerism. Wanting the latest phone, buying cheap mass produced clothing, wanting to travel the world.
Climate change is a massive issue but it's the young that need to look at themselves and their behaviour. This has changed massively in my lifetime, esp since about 2010 I'd say. There used to be more education on this than ever, it's covered at school etc - so why aren't young people taking it seriously?