I was 29 at my "showy" wedding and my mum helped me pick my dress and talked about stuff, but otherwise that was it, certainly wasn't about flashing the wealth.
As for being showy, it wasn't that - I wanted to get married in a castle because I'm a history freak, the idea of being married surrounded by somewhere with that kind of heritage made it my perfect day. So that limited us in terms of venue costs, there aren't many cheap castles! DH didn't want to split the ceremony and the dancing/dinner, so we had it all in one place, which then not only tied us into their chosen catering supplies (choice of 5 - none cheap), we had to hire in everything from chairs and tables for the dinner to a portable bar unit and sofas for people to sit on in the bar area as there was nothing available from the venue itself.
We had 120 guests as DH's family is HUGE and we have a large group of friends all of whom we wanted to share our day with. I didn't want to do evening only invites as the castle was in the middle of nowhere so most people were going to need to stay over and I felt that it was rude to expect people to fork out for travel and hotel then only let them come for a couple of hours at the end, felt we at least needed to give them a good meal!
So really, that was most of our budget, and why we spent that much. Although to be honest, I'm not sure why I'm justifying myself, it was a fantastic day, everyone who came said they had an amazing time and if a few people on the internet dismiss it as "showy" then it's not the end of my world 