Vicar, you can have it around your eyes - sideways (ie crows feet etc.), and yes it will make a massive, but subtle difference if you go to someone good. Under your eyes not so much. I'm 40 too
I've had it on my number 11s for a few years now and it is amazing! So subtle but just eradicates that "I'm a cross person" look. I've never worn sunglasses, my whole life, and I'm paying the price early
I also have never really worn make-up (foundation etc.) so I am obviously thrilled!
My problem now, pleeease help me, are two deep lines below my eyes. Not directly under them, lower, they appear when I squint or smile. I imagine the no sunglasses thing is the reason.
The lovely woman who does my botox says that she can't use it there, but then she hummed and haad and made me squint and relax loads of times and did a miniscule amount around them, and I think it did make a tiny difference.
I'm seeing her again next week for my number 11s, please can anyone tell me what I can do for these horrible lines. Should I encourage her to go botox crazy on them? (they are a centimetre or more below my eyes) and they make me look crap, exhausted and about 30 years older 
Or is there something else for this area under the eyes? Proper lines, not just shadows, troughs or whatever...
Please help me