Dunno about age being anything to do with this, but my pages have had a PR boost by 1, except the homepage.

Homepages not being updated. This a proper full update or a partial one?

Yeah. Pr update going on. Lost lot of PR but also gained some from 0

this seems to be the regular 3+ months pagerank update.

all pages of mine (like a few thousand) over all servers, which have been online before 1st of april AND had some links (more like a few hundred) have PR now.

This is not an ongoing process, this was a roll-out and it is done!

Pagerank for pages, which have been published before 1st of April AND(!) had links then!

P!

Sorry I don't understand. I got 2 PR5 links (1 pr5 well before April) and then used one of those PR prediction tools, the tool suggested I would get a PR5 rank, and I thought that was for the homepage, but am still a 4, despite my other pages gaining PR.

This has never happened to me before, so am naturally puzzled and a bit confused. My PR previously had always increased without a hitch, so yeah, it's wierd.

Please advise

Is PR update finished?

I've heard it's still bouncing around a bit. Who really knows.

Still bouncing around... some pages showing greyed out, then have PR then greyed out (different data centers perhaps...)

Also in Google's Webmaster Tools under Statistics I see the following:

Your page with the highest PageRank
Apr Data is not available at this time.
Mar http://www.example.com/
Feb http://www.example.com/

This is true for all of my managed domains as far as I can tell.