The minority who are willing to look past your age (who will also be the better ones to work for) will pick up on your persistence and see it as a positive trait and hire signal.
As to the resume - there's lots of advice out there on resume advice for older workers. Truncating / condensing lists of older gigs is one of the standard techniques.
The rest of what you do is a variation of the same advice as applies to younger candidates - just that in your case it will have even more protective benefit,
For example - even though it may bore you a bit, be sure to both read (or carefully skim) as many modern books as you can that are relative to your field, as well as to stay up on the "shiny" stuff (cloud, containers, CI/CD) even though your gut instinct will (rightly) tell you they may be overhyped or less important than knowing the core principles.
That is - at least know what they are, what problems they attempt to solve and what they are basically made of. This will make is substantially less easy to dismiss you as a dinosaur (inflexible / crusty / less nimble than younger candidates).
Finally: wear your age with pride. You've lived through times, and have seen things these people can only read about (for those who even read these days). You have a rare perspective to offer, and the better folks out there will see that and dig that aspect of you. And will be proud to have you in their corner and on their team.