This is not true. The Affordable Care Act does not set rules connecting a patient's age to his covered treatment. The ACA relies upon private health insurance to cover people at their jobs, or at the new exchange/marketplace. At the exchange, the rates charged to people can vary by age (within limits) but the covered services are identical for all customers in the same plan.
As a practical matter, the vast majority of 76-year-olds are covered by Medicare. Medicare's covered services were not changed in any significant way by the Affordable Care Act.