Every generation tends to look at the kids of their day and see them as substandard. There are inscriptions from several hundred BCE that make many of the same complaints. The evidence is that no matter how weak and dumb the kids seem collectively they always do okay. If any generation had failed catastrophically across the board we wouldn't be here.

Kids tend to adapt to their situation. Situations change. The knowledge, skills and personality traits that worked for our ancestors are not the same that are vital today. The ability and willingness to work sun-to-sun tilling a field isn't so important.

Kids adapt. But also, we have adapted. We too easily forget that when we were young we were stupid and weak. Give them time. Don't underestimate them.