It Gary's but in the UK,if you have something legal to do with age its the first,so if your 18th is the 29th,technically you can't drink alcohol until the first.
Anniversary's are difficult I decided on the first one that trying to pretend it isn't happening was worse than marking it in some way, so maybe if you think of something meaningful to you that is a mark of the love you shared planning that is a diversion daft as that sounds.Maybe because its a bit like you're doing something for them.