No.
I did my second season when I was 23 (Banff, Alberta and Whistler, BC).
There were two other couples in our house (28 & 31 and 34 & 35 respectively), a 25 year old girl and a 45 year old guy.
I met a fair few other people in their thirties and forties although admittedly the lion’s share of seasonaires were in the 19 – 25 bracket.
I wouldn’t worry about being inundated with upper-middle class hooray henry types unless you’re planning on going to Chamonix, Meribel or a few other resorts…basically avoid anywhere where Jack Wills is more commonplace than Volcom in the bars!
Actually, bugger that…just go where you like, Cham is awesome.