Thoughts on these?

[Brom]

I didn't mean to suggest that white wines cannot be aged - I did mean to suggest that such a thing is not something a novice should contemplate. You may note that the grapes you suggest are not mentioned by the OP or responders.

Certainly for a properly made Riesling (IMO, the base for the finest whites in the world, Burgundy notwithstanding), 10-12 years is only a beginning. These wines will not be had for $10-12 though.

I would ask if you have found an inexpensive Vouvray to be a reliable candidate for aging? I actually see very little of this appellation priced inexpensively. Samewise with Savinierres - if any at all is to be found, it won't be under $20.

As to Oz Semillion, again the novice question rears its head. Heck, I'm no novice and I would not have thought of this wine (Semillion at all) as a likely candidate for aging. Would you drop a name on us?

Finally, this opinion is based only on my own knowledge of wines and wine merchants, but I wuld hesitate to suggest that many, let alone any reputable wine merchant could offer suggestions on these wines. Certainly some. I would think that among specialty wine merchants there will be some more who can help a consumer with questions on these wines, but again, not even all (or "any") of these. My experience is generally limited to shops in NYC and NJ.