If you're hiring a senior engineer, it doesn't really make sense to filter out the older demographic. Do you expect a 25 or 30 year old to have 15 years experience in a work environment and 10 years in using XYZ stack/language/tech?
A lot of companies don't care if you have x years of experience. They hire based on what they think is talent, and then train them. Even for senior-level positions, they may only care that the person is senior, not necessarily, "has x years in language x".
To be sure, there are companies that do care about domain experience - and I personally value it as well. But that experience often carries a price that some companies will jump through hoops in order to avoid paying. I've seen that first hand, unfortunately.
