New to posting here but have been a long time lurker. I can't say that I have ever really paid too much attention to the ski size selectors. I am 57, 205 lbs. 5'9" tall, east coast skier (Wildcat, Cannon, Attitash Sunday River for the most part), skiing since my mid 20's and am somewhat advanced although I would not consider an expert by any means.
I found this whole height versus weight thread to be fascinating. I am currently shopping for a mid fat to add to my collection (which is how I found this thread). Depending on the rocker I'll be looking for something 175 to 180'sh in length that will have a little more float than what I have now. Currently I am skiing on a pair on a pair of of Atomic Crimson Ti's 164's and a pair of Salomon Tornado Ti's that are 173's (my main ski). The Atomics are fun to play with because they are so short and have such a short radius; I use them mostly in bumps and in the glades. As you can imagine they get pretty squirrely when I let them run. I love the Salomons on hard pack... They are fast edge to edge but are still stable at full speed. When I demo'd the Salomons I tried both the 173 and the 180. For me they felt very different.. the shorter ski felt snappier and more playful, more of what I was looking for at the time. It was an eye opener for me. Point is I think the ski length depends on what you are looking for... the length in the charts are only a starting point. Height & weight both come into play but what matters most is what you like. I am probably going to end up with 3 different skis with 3 lengths.. and I am ok with that.