Look back in clarity

Anyone else out there a bit scared of (shhh) thirty?
Perhaps, I have decided, it is far worse in the anticipation than the doing of the thing.
Thirty will be grown up. My thirties will be years of sorted-ness and certainty, after these twenties of finding my way around.
I am old enough for nostalgia now.
I can feasibly and with authority look back on things. Is that a good thing? And I have the wisdom of age, to see oh-so-clearly the places where I went wrong.
Children - who are not that at all but probably way into their twenties - look young and wear hardly anything and drink too much. And were once me...