That sense of a life in natural objects which in most poetry is but a rhetorical artifice was then in Wordsworth the assertion of what was for him almost literal fact.
Prior to Wordsworth humor was an essential part of poetry. I mean they don't call them Shakespeare comedies for nothing.
But I think it's more that when you're young you're invincible you're immortal - or at least you think you are. The possibilities are limitless you're inventing the future. Then you get older and suddenly you have a history. It's fixed. You can't change anything. I find that a bit disturbing to be honest.