While I think the idea of allowing all vet rewards be usable at any account age is a bit much, there are some compromises I'd go for....
1. Dye Tubs should be usable by any person friended, co-owning or owning the house they are locked down in, regardless of age, and have the option for Guild member security, that would allow non-friend guild members to use as well. Normal visitors to the house, or those trying to use them on their person, would still be limited by the age requirements.
2. Ethereal mounts should be redone as to their availability. Make the horse a year 1 reward, the llama & ostard year two, the Ridgeback, unicorn & ki-rin year 3, beetle & swampy year 4, have an ethy Hiryu at year 5, an ethy reptalon at year 6, the Cu at year 7, and leave the polar bear at year 8. And, for the love of God, make the statues for the swampy and beetle in the 2D pack smaller!!!
3. Statues would be usable by any age.
4. Other deco items (banners, shields, flaming heads) retain their age required to claim, but must be at least half that age to use.
5. Reward Clothing remains age-tied, but one should be able to go to a specific shrine and meditate, to change the resists to a different +3. 4 of the Trammel & Felucca shrines would be for +3% in one resist, 2 more, plus the 3 shrines in Tokuno, would give +2% in one resist, 1% in a third (would have to come up with mantras for the Tokuno shrines). Valor Shrine would give 1% in each of the 4 elemental resists.
The Humility shrine in Trammel & Fel would reset the robe to default 3% physical, while the Chaos shrine of Ilshenar would give you 5% scattered in random resists.
The other shrines (tram/Fel Chaos, most of the Ilshenar shrines, and the Luna & New Haven shrines) would have no affect, and one must wait a week between changes (other than using the humility shrine to reset to default physical resist).
6. A collection system would be put in place that would allow a person to turn in old vet rewards for points toward new ones. Each existing reward would be worth 10k points, and one could claim any reward they normally qualify for at a cost of 100k. The net result would be the reduction of old junk rewards (like statues) in exchange for a few more valuable higher rewards.