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The paper presents magnetic field measurements for 15 chemically peculiar(CP) stars of subgroup~1b in the OrionOB1 association. We have found that theproportion of stars with strong magnetic fields among these 15 CP stars isalmost twice as large as in subgroup 1a. Along with this, the age of subgroup1b is estimated as 2 Myr, and the age of subgroup~1a is in the order of 10 Myr.The average root-mean-square magnetic field Be for stars in subgroup 1b is 2.3times higher than that for stars in subgroup 1a. The conclusions obtained fallwithin the concept of the fossil origin of large-scale magnetic fields in B andA stars, but the rate of field weakening with age appears anomalously high. Wepresent our results as an important observational test for calibrating thetheory of stellar magnetic field formation and evolution.

Magnetic Fields of CP Stars in the OrionOB1 Association. IV. Stars of Subgroup 1b