Both in the respect of prejudice against elderly but also prejudice of any singled out age group. 

Suggested level: Level 3

Logan's Run by George Clayton Johnson, William F. Nolan 

A Place to Scream by Jean Ure (It is the year 2015. Old people are dumped on motorways, teenage beggars crowd the streets...). 

Disguised by Pat Moore – true story Pat as an experiment disguised herself as an old lady and was horrified at the way she was treated. Excellent read. 

Turnabout by Margaret Peterson Haddix – Fiction. Experiment of drug used on 80yr olds that makes them every year a year younger. May not quite fit the bill but a fascinating and well written story. 

Memory by Margaret Mahy (too young?) 

The Stolen Childhood by Carol Anne Duffy (four stories)? 

The Declaration. Longevitity drugs mean you can live forever. However, earth's resources become stretched so The Declaration states that no more children are to be born. Any children who are born are called Surpluses, and this group experiences prejudice. 

Warning by Jenny Joseph 

POEMS 

Playing God by Glen Colquhoun's 
The Smell of a stroke 
She took one pill for her heart 
What sort of day will it be 

Ageism by Satish Verma 
http://www.poemhunter.com/poem/ageism-2/ 

You are old Father William by Lewis Carroll 

WHEN I AM AN OLD WOMAN I SHALL WEAR PURPLE 
With a red hat which doesn't go, and doesn't suit me. 
And I shall spend my pension on brandy and summer gloves 
And satin sandals, and say we've no money for butter. 
I shall sit down on the pavement when I'm tired 
And gobble up samples in shops and press alarm bells 
And run my stick along the public railings 
And make up for the sobriety of my youth. 
I shall go out in my slippers in the rain 
And pick the flowers in other people's gardens 
And learn to spit 

You can wear terrible shirts and grow more fat 
And eat three pounds of sausages at a go 
Or only bread and pickle for a week 
And hoard pens and pencils and beermats and things in boxes 

But now we must have clothes that keep us dry 
And pay our rent and not swear in the street 
And set a good example for the children. 
We must have friends to dinner and read the papers. 

But maybe I ought to practice a little now? 
So people who know me are not too shocked and surprised 
When suddenly I am old, and start to wear purple. 

Taken from the book 
When I Am An Old Woman I Shall Wear Purple. Edited by Sandra Martz. Papier Mache Press--Watsonville, California 1987