Epson photo inks seem to not fade as readily as others. I have some that are a couple of years old that are still in fine shape.
Make sure not to soak off the decal adhesive before applying. Since you seem to be experienced at applying decals I'll not get into the Do's and Dont's.
If to be used on a Nitro plane, be sure to fuelproof the entire decal with either clear spray (LustreKote works well) or balsa-rite for film.
In all cases, be sure to apply some kind of sealer around the edges to prevent pealing. (balsa rite, clear laquer, nail polish, etc., as appropriate for the fuel source.)

Regards,
G42