question about modifying age

[Ragnarok-X]

i want a spell that decreases the age of unit, but not a ritual one, but a buff to permanently modify army units instead of commanders-only.
I went ahead and tried this

#newspell
#copyspell "Rejuvenate"
#name "Rejuvenating Winds"
#description "By drawing in the astral winds, the mage can shroud a few fellow warriors with a small regeneration effect in addition to make them younger by 4 years."
#school 1
#researchlevel 2
#path 0 4
#pathlevel 0 1
#fatiguecost 60
#effect 101
#aoe 3005
#precision 2
#range 5015
#damage -4
#end


snce effect 101 is age according to the spell db. However, the mage doesnt cast the spell.
The damage -4 value is taking from rejuvenate where the actual age-decrease is measured in negative damage.