As someone comin up on 50 myself, I have to say age has yet to be an issue with my career. Maybe I don't go out of my way to advertise it (cut the resume down to the past 10 or so years, don't have a face full of white hair), but I'm still landing plenty of the same ole gigs with Typescript, Ruby on Rails, Python, whatever the flavor of the month is. So I guess my advice is to just ignore it?
Of course, trying not to giggle at the 28 year old who thinks they need 4 meetings a day for their precious startup is a different matter. But as long as they pay on time...