That's very worn down, probably helped that it was an iridium one as they have a pretty large gap to begin with, more than 0.8mm from new I'd say
yes your right, lesson learned, not like me but the are long lasting (clearly not !) well not 7 years but the car has fired up rapid every single day for those years so I just didn't bother messing with them. Quite a tiny tip on those, might try the NGK Iridium next time around.