Meb, who turned 40 on May 5th, will compete in the half marathon.
The KyXy host will run Rock 'n' Roll San Diego on May 31.
For the Johnstons, 26.2 miles is a way to bond as a family and battle a devastating disease.
The Masters division is as strong as ever.
The 5K will take place the day before the marathon and half marathon.
The 91-year-old became the second oldest marathon finisher in U.S. history and set a new age-group record.
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Deksisa, Dibaba capture titles; Keflezighi leads hundreds under 1:30 mark.