Funny you should mention being ID'd
I've also been asked for proof of age recently (two supermarkets and a offy).

It's brilliant. I'm 36 and have a beard.

Has there been any change to the law that makes people more guarded?

I've not been asked for proof of age since I was 19.
( JeffTheDogFucker Can you dig it?, Thu 13 May 2010, 18:23, 3 replies)

I don;tkonw but I was ID'd 4 times in a row at my local supermarket last year.
I was 30. I was smug about it, until your story. :P
( Crap Little Monkey Deathstar, so good they built it twice, Thu 13 May 2010, 18:55, closed)

Enjoyed a wonderful ID'ing experience in Tesco
The girl on the till didn't have english as her first language and was in the process of being trained.

The question, asked in almost a whisper was 'are you 18'?

To which I replied 'no'

The trainer looked a bit uncomfortable as I was, obviously, over 18 and asked me 'how old are you?'. When I said 'I'm 36' she said 'Why didn't you say that?'

Well, the question was specifically 'are you 18?' not 'are you over 18'

That put her training back a few days!
( JeffTheDogFucker Can you dig it?, Thu 13 May 2010, 22:33, closed)

At Morrissons in some shitty backward rural town while on holiday
They refused to serve my mum and stepdad (59 and 60 respectively) because they were buying a bottle of wine and my sister and her fiance (29 and 39) were standing near them. After we'd sorted out ID for my sister, me and the missus (32 and 31) also got ID'd. The missus produced her driving licence (only form of ID she had) to be met with the reply "Is Canada in Europe?" When we realised that they only accept European driving licences as ID, we answered "yes". The joys of being interrogated by cud-chewing tillmonkeys, eh? They never ID'd me when I was 15 and buying cheap cider to drink in the park...
( emvee cruor deo cruoris, Fri 14 May 2010, 11:27, closed)

Yep
If people think you look under 25 they'll ID you. I get asked all the time. It has stopped being flattering and is now just annoying (I'm 30), especially when I've forgotten to bring out my driving licence.
(Hovercat, Fri 14 May 2010, 12:50, closed)