Ask HN: Does startups hire above 35 years old employees?

Every time I take a peek at a startup profile page on their website you can only see 20 something in the frame. I know that many startups are created by people at this age, but as the company grow (25-50 employees) I wonder why I can't still see some older people there. I'm not talking at all about people who are 50 plus with some grey hair that are missing entirely from the pictures.