I feel I can relate to that, I'm still in my twenties and has recently begun to see in myself and some of my friends this eternal shift from youth to 'adulthood

I feel I can relate to that, I'm still in my twenties and has recently begun to see in myself and some of my friends this eternal shift from youth to 'adulthood' (this words don't reflect my points accurately but I lack the proper ones right now), the loosing track of the dominant (sub)culture(s), the "it was best before" phenomenon. But this is completely subjective, maybe "old age" come from the tiredness to be always updated / on page with the current trends, happy with our past experiences and memories. Is there a best moment ? somewhere everything has to change and everything will change.