Several issues here, but I will assume the participant received a valid Suspension of Benefits Notice when they attained NRA. The SOBN eliminates the need to provide an actuarial increase from NRD, but the participant is still entitled to plan formula increases for continuing to work. If they didn't receive the SOBN at NRD, you may have other issues.
However, post MRD, the plan must provide BOTH the actuarial value of the delayed payments, plus any additional service/compensation related increases.
Plan document should detail the specifics of each scenario and there are a few possible ways to handle it.
Are you saying this 95 year old participant is still actively employed?
Check out 1.401(a)(9)-6.. Q/A 7, and others.