Reyes is 40 already-(is she the oldest at ABT...?)-,
If Wikipedia can be trusted, I think Julie Kent at 44 is oldest. Herrera was born in 1975, Kent in 1969, Murphy in 1979. I can't find a birthdate for Reyes in a quick Google. A few more: Vishneva 1976, Cojocaru 1981, Semionova 1984.