Hi moka19!
Well I browsed through some cabin crew websites and it seems like people who actually attended the opening days and for the people who were successful, it "seems" like they tend to hire people who are aged 20-27.
But this doesn't mean that there no possiblities or there's no chance for the people who are around 28-35.
There are alot of people who are around 30 and challenging their careers as a cabin crew.
If you really want the job, I guess the age doesn't matter.
Never give your dream up! You can do it!