A lot of It workers are white males, and making any discrimination claim as a white male is challenging, especially if you're only in your early 50s. You can expect low unemployment figures and high salaries to be trotted out as examples of how you're not really a member of an at-risk class.
What I'd wager is intrinsic to the problem of age discrimination is that older workers often have family commitments, and when combined with spouses working at similar professional careers and children, leads to an apparent decline in workplace engagement. The older employee is less able to devote their lives to the job (learning new tech for free in their own time, or at least less of this, working overtime hours, short-notice travel, etc).
IMHO, it's less "age discrimination" than "life situation discrimination". Younger employees living in rental housing without spouses or children are just more competitive in the workplace because they have nothing to do but work.
I don't really know how you fix it, either. In an ideal world, I'd presume that the *society* would recognize that children come from parents and parents need to engage in their families to produce productive, well-educated children, and that workers of parenting age are going to be less engaged. Thus, labor would be structured in a way that doesn't penalize this kind of natural life cycle.