Yes, it becomes less of a health issue once an infant grows up but it’s a good idea to top up immunity if you’re likely to be around infants and whooping cough is currently circulating in your community (i.e. community). Also some people assume immunity is passed on as long as they continue breastfeeding, while this is partly true this is not ideal, far better protection is gained by vaccination during pregnancy.
Ha, yeah I can imagine that’s a lot of jabbing!