I hit my one year anniversary this past summer (July I think.)No fanfare, because it did not really matter how long I have been doing it. What matters is that is that I enjoy it. There is a bonus for others who like it.
I blog for many of the same reasons, and have a similarly unfocused blog (I really started out with one.)
This posts should be on the reading list for anyone who has been blogging for a while. It will help remind you why you started in the first place.