What are you basing that statement on? I am nearly 70 years old, have not had a vaccine for more than 50 years, i rarely get sick with anything.
Vaccine schedules are clearly published. Virtually none are single shots lasting forever. Most have multiple boosters. Polio requires four shots. Tetanus and pertussis require regular boosters. Influenza requires regular boosters. Adult vaccine schedules are available here (among many other sources): https://www.cdc.gov/vaccines/schedules/hcp/imz/adult.html
Good for you, good luck with the Rona you will need it. How many comorbidities if it’s more than two you have a greater than 10% CFR at 70+ John’s Hopkins has a death calculator google it put in your health status and it will spit back how many in that same cohort has died based on data good till last week.