We don't know the AREDS 2 study to determine if supplements help people without ARMD has about 5 more years to run
JCH MD
The AREDS (age related eye disease study) does not show the efficacy and safety of taking a high dose vitamin beyond 8-9 years. So, unless you've got a family history of ARMD or currently have intermediate stage MD, or other retinal/macular problems the benefits of taking an AREDS supplement is unknown. Although, the scientific community is currently researching the benefits/risks of long-term usage of the supplements, the results won't be published for another few more years.
At your age I would just stick to doing the common sense stuff: eating a healthy diet, exercising, getting regular eye exams, and practicing proper eye safety (and hygiene, especially if you wear contacts).