Actually when I was a student in the 80s/90s I used to pick apples during summer holidays/autumn and I worked with quite a few middle-aged /old people (all retired). They used to go to harvest the strawberries for Tiptree all summer, living in caravans and then go on to the apples in late summer/autumn. They loved it as a way of life. When I worked for a forestry company one Easter, apart from me and a couple of other girls all the other temporary workers (working out in the muddy fields) were men of 70+years.
I used to see adverts for the jobs in the local paper but now it's all done via agencies/gangmasters. I guess local students barely get a look in these days.
(Still think the MP is crazy and unfair about the wage issue by the way, just pointing out that even up to relatively recently older people used to do these jobs.)