Adult immunization schedule question. Are all adults of any age now supposed to get tdap?

Most should get this. Tdap is recommend for adults of any age who will be in contact with babies and children-particularly babies younger than 12 months. Additionally, pregnant women and adults who may be exposed to pertussis through their occupation (helathcare etc) should get protected. People who have sensitivities to components of the vaccine should discuss their options with their doctor.
ONLY ONCE. Tdap is given only once in your life time and after that you are adviced to get td booster every 10 years.
Yes. Some estimate that 70% of whooping cough cases are spread from underimmunized adults to kids. Babies died in la last year from pertussis. In canada, the pertussis rate dramatically dropped when adults received the tdap booster. Do it.
Yes. Having pertussis (whooping cough) doesn't grant lasting protection & neither does the childhood shot. Unvaccinated babies, especially under age of 2 months, have no protection. It's not transmitted from mom. Adults carry the disease and put all babies at risk unless vaccinated. Pertussis is an annoying 3 month cough in grown-ups but deadly to infants. They can literally cough themselves to death.

Related Questions

Adult immunization schedule: what are the basic recommendations for normal healthy adults?

See below. Here's a chart of the recommendations according to the cdc: http://www.Cdc.Gov/vaccines/recs/schedules/adult-schedule.Htm. Read more...
See below. For someone who has had all recommended childhood vaccines the following are recommended for adults: dt (diphtheria tetanus) every 10 years, with 1 dose of dtap (diphtheria tetanus pertussis); hpv (3 shots) for women and men under 26; shingles for adults 60 and older (once); pneumococcal at 65 or older (once); and flu every year. Ask your doctor if you're at risk for other preventable infections. Read more...