The Verdict: Need More Info
Every agreement starts at 18, so you cannot apply yet. Come back when you turn 18, and meanwhile check whether you are Irish through a parent or grandparent.
The upper limits differ: 35 for Argentina, Australia and Canada; 30 for Chile, Hong Kong, New Zealand, South Korea and Taiwan; 25 for Japan, or 30 with full-time education or employment.
Several agreements have quotas, and some open only at set times of year, so plan the application well ahead of your trip.
A parent or grandparent born on the island of Ireland may make you an Irish citizen already, which would let you live and work in Ireland without any of this.