I'm not sure if it's age restricted (i've never been asked anyways!), although it seems more towards the under 25s but in certain Boots in Scotland, you can pick up free packs of Pasantes. They give you a wee card, with all sorts of options, and you tick the ones you want (eg trim, original, large, black, latex-free etc. etc.) I'm not sure if there's a limit on how many packs they give you at once, I've only ever gotten two (24 condoms). Like Alice, I have my usual stash of regular ones, that I keep topped up, but its a handy scheme to pick up the more unusual ones.