Looking good, and reducing nat by 2 vs jade is also fine.
[FONT=Courier New]Age...................Speed........................Initiative..Armor Class..........................................Special Abilities..............Caster..SR
Wyrmling.....40 ft., fly 40 ft.(good), swim 30 ft......+0......16 (+2 size, +2 natural), touch 12, flat-footed 14...Hold Breath..............................
Very Young...40 ft., fly 50 ft.(average), swim 30 ft...+0......18 (+1 size, +5 natural), touch 11, flat-footed 16...[/FONT][FONT=Courier New].........................................[/FONT][FONT=Courier New]
Young........40 ft., fly 50 ft.(average), swim 30 ft...+0......21 (+1 size, +8 natural), touch 11, flat-footed 19...[/FONT][FONT=Courier New].................................1st[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Juvenile.....40 ft., fly 50 ft.(average), swim 30 ft...+0......23 (+11 natural), touch 10, flat-footed 21...[/FONT][FONT=Courier New].........................................3rd[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Young Adult..40 ft., fly 50 ft.(average), swim 30 ft...+0......26 (+14 natural), touch 10, flat-footed 24........[/FONT][FONT=Courier New]........[/FONT][FONT=Courier New]...[/FONT][FONT=Courier New].........................5th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Adult........40 ft., fly 50 ft.(average), swim 30 ft...+0......28 (–1 size, +17 natural), touch 9, flat-footed 26...[/FONT][FONT=Courier New].................................7th[/FONT][FONT=Courier New]....[/FONT].[FONT=Courier New]
Mature Adult.40 ft., fly 50 ft.(average), swim 30 ft...+0......31 (–1 size, +20 natural), touch 9, flat-footed 29...[/FONT][FONT=Courier New].................................9th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Old..........40 ft., fly 50 ft.(average), swim 30 ft...+0......34 (–1 size, +23 natural), touch 9, flat-footed 32...[/FONT][FONT=Courier New]................................11th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Very Old.....40 ft., fly 50 ft.(average), swim 30 ft...+0......37 (–1 size, +26 natural), touch 9, flat-footed 35...[/FONT][FONT=Courier New]................................13th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Ancient......40 ft., fly 60 ft.(poor), swim 30 ft......+0......39 (–2 size, +29 natural), touch 8, flat-footed 37...[/FONT][FONT=Courier New]................................15th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Wyrm.........40 ft., fly 60 ft.(poor), swim 30 ft......+0......42 (–2 size, +32 natural), touch 8, flat-footed 40...[/FONT][FONT=Courier New]................................17th[/FONT][FONT=Courier New].....[/FONT][FONT=Courier New]
Great Wyrm...40 ft., fly 60 ft.(poor), swim 30 ft......+0......45 (–2 size, +35 natural), touch 8, flat-footed 43...................................19th[/FONT][FONT=Courier New].....[/FONT]
Agreed to all that; emphatically so for hold breath.![]()
I'd prefer to keep them same as the gold. Their spellcasting will already be really out of whack with their rellative power level in other areas.
We'll need to come up with some SLAs for these guys, too.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.