I'm not even close to 40, nor do I own Billabong shorts and I think I might one Animal tshirt in the pile I wear when doing DIY - but due to frankenfeet the only shoes that I can buy in a normal shop that fit me are DC Court Graffik so its pretty likely I'll still be stuck with them >40 :(
* People who still don't understand how email works despite working with it for ten+ years - "can I unsend that email I sent three hours ago from my phone?", the woman I worked with who put "RE:" at the start of new subject lines
* Radio ads with "cute" kids voices, generally lilting and...