! Variable setting
      ctrcnm    (jp_age) = 'Age'
      ctrcln    (jp_age) = 'Sea water age since surface contact'
      ctrcun    (jp_age) = 'year'
      ln_trc_ini(jp_age) = .false.
      ln_trc_sbc(jp_age) = .false.
      ln_trc_cbc(jp_age) = .false.
      ln_trc_obc(jp_age) = .false.