Is it possible for an older person to overcome ageism and succeed if they have the skills?

To overcome ageism and succeed, you must look outside the box. Creating value is the key to a successful transferable career. First, you need to keep your technical skills current, stay in shape, physically and otherwise, and demonstrate that you can apply technical skills to solve problems important to the business.
Be alert, excited, animated, glad to be there, interested in what they do, have good stories practiced, and ready to recite that relate to your vast experience in that field.
Most resume writers will tell you to include “value” statements in your resume. This is true as far as it goes, but you need to choose the value statements related to the company as much as possible. It also helps to understand how to make your company successful on challenging projects.
So if you make yourself and your knowledge both up-to-date and essential, you can overcome ageism.