I think the most unconscious or perhaps completely conscious bias that I'm not sure I'm seeing mentioned with age is salary requirements and other various forms

I think the most unconscious or perhaps completely conscious bias that I'm not sure I'm seeing mentioned with age is salary requirements and other various forms of compensation. Older people are thought to have mortgages, families, etc. They often cost more money, and work less hours. That's simply never thought as attractive to employers who want more work hours for less money. Disclaimer: Not saying this is right - but I think that's a big part of it.