I actually have encountered alot of ageism the other way. I'm in my late 30's now, it isn't as bad as it once was. Comments like "supermarkets in nightwear" show how it goes the other way too. The comments made here demonstrate the contempt from the poster, who is clearly stereotyping all young people. I hope when I am older I would have the decency, and wisdom, not to make sweeping generalisations.
I have had older people talk to me disrespectfully, treat me like I'm stupid, and in a way they would never do to older people. I am a Mother, educated and respectful, nice to people. I have found it depends on the person. There are some lovely, and absolutely amazing older people, but when I was in my 20s, working in retail while at uni, some have reduced me to tears.
Life is difficult, no matter how hard young people work, they can't get onto the housing ladder. In the 90s my dad supported a family of 4 on one lower than average wage, bought a house, car etc, and we had a decent lifestyle. Now this is impossible, even with two wages much of the time. There has always been hardships in life such as poll tax etc, but not getting mortgages no matter how hard people work, is horrendous. I was lucky that I got on the housing ladder a few years ago, in the nick of time.
Give young people a break, the world is tough!