The Compendium of Caraka 1.5.81

1.5.81

nityaṃ snehārdraśirasaḥ śiraḥśūlaṃ na jāyate/
na khālityaṃ na pālityaṃ na keśāḥ prapatanti ca//

Headache does not arise in one whose head is constantly moist with unctuous substance, / nor baldness, nor premature graying, nor does hair fall out;