For example, at specific jobs in the government you get extra holidays if you're above a certain age. Why they think older people deserve more holiday is beyond me. It has nothing to do with how long you've worked there since a 29 year old that has worked there in 10 years wouldn't get as much vacation as a 40-year old that recently was hired. It has nothing to do with experience. Just age.
I can say as a young developer, I have felt this age thing several times at companies. They just don't give you the same salary or take you as serious because of the age. It doesn't matter how skilled you are or how much value you provide to the company.