Hook being frozen would have no implication for necessarily concluding anything about Tink’s age, as he was frozen in a small bubble in FTL while Emma went from birth to 28. Everyone in SB also did not age during that time.
So if Tink was born, then got frozen in the bubble or cursed SB, she would be chronologically 1 or so. But fairies are shown as arriving the physical age they are, not as growing from baby to adults in the Disney Fairies version anyway. They pop out fully formed.
So OUAT could write fairies as originating that way (they showed Dwarves hatching fully grown, remember). If so, her age could be 1, but she’d look mid 20’s and act …well, it is Tinkerbell. She could be written as acting like anything from a mature woman to a small child, depends on how they want to go in OUAT.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass