Having whooping cough does not leave you immune and while vaccination is the best defense against the bacteria, protection does wane over time. A whooping cough booster at least every 10 years is a safe and effective way to bolster protection.
In Australia, the whooping cough booster comes as a combination vaccine that also protects against diphtheria and tetanus, both of which also require boosters at least every 10 years to remain effective.