It is hard to say.
I believe at first the resume says a lot, and your answers in the application. The way you word things, the layout on a resume is important, ive found. But just being real and yourself, and simple.
They have their ways and means of sifting through, I have no Idea.
I got in first go, first airline i applied for, totally a newbie to the industry. So cant say. Then again people who had a lot of experience didnt, some did.
Only have a lot of people skills and extensive customer service in many environments which can transfer to cabin crew.
I have no idea. I dont think age is necessarily a factor, as older people at my AD got through also.
Its a hard one. The hardest thing is getting past the initial application I think, as im the type of person that likes things face to face. But i did put hard work into my application, but answered and put in honesty, integrity and truth.
Good luck all