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I don't do epic so I may not be any help but what do you mean when you say "advanced to level" 144, 50, or 55?  Are you looking for those creatures to be advanced to that many HD?  Where there Equivalent Character Level (ECL) would be that high?  To where there CR is that high?  There are unfortunately many ways to look at "level" in the game.

I also wonder how you want them advanced.  As dragons or are you advancing them with class levels?  Advancing them with racial HD is actually pretty easy because racial HD are not subjected to the Epic rules regarding BAB and Save.  I do seem to remember seeing somewhere that creatures can look an their HD to determine eligability requirements for Epic feats (Epic is 21+ HD) although even if you just let creatures with CR 20+ access epic feats that should be easy enough for a dragon.

Although it may seem completely irrelevant I'd point out that the Great Wyrm Red and Gold dragons are already "epic"challenges.  At old age (and gargantuan size) the Gold Dragon passes CR 20 and at great wyrm is CR 27.  The same is true for the Red Dragon although it is only CR 26 as a Great Wyrm.
 

I'm still not sure what you're looking for but I'll say I'm not about to try and completely fill out the sheet for an epic dragon.  Now using the information in that link is this the kind of "help" you are looking for?

Epic Gold Dragon (age category 16) CR 35
Size C+
HD 55d12+825 (1183 hp ave)
STR 55, DEX 10 CON 41, INT 36, WIS 37, CHA 36
BAB/Grap:  +55/+93
Attack +69
Saves:  Fort +44, REF +29, WILL +42
Breat Weapon 32d10 (save 52)
Frightful Presence DC 50
fly speed 300 ft;
DR 15/epic;
AC 56 = -8 size +54 natural;
Caster Level 27,
SR 41
Bonus feat:  Improved Spell Capacity x2 
Total number of general feats 19 (5 may be epic)
Skill Points:  1102 (max ranks 58) 

Jan 17, 2013 -- 2:54PM, Dark_Ansem wrote:

it is, for a beginning :D needs more detail but thanks!

Sorry but figuring out where to put about 20 feats, distribute 1102 skill points (that's still 19 skills at +58 RANKS and even 29 ranks as cross-class skills), and what spells to select is NOT something that is just easy to do.  Although this is a "standard" Advanced Dragon there are just so many ways to optimize this that the possiblities are nearly endless.  There is no way to give you details when you don't provide any details on how you plan to use that monster.

Ok under the draconomicon exist 3.5 rules to update the dragons you can see a example in Power of Faerun (a red dragon CR 40) pag 121 and the rules of epic dragons in the pag 99 of Draconomicon say how advance the dragon, remember that a dragon can select epic feat starting her old age category.

Oma is right. Draconomicon pg. 86-100 has a few dragon specific Prestige Classes, as well as rules for advancing dragons past Great Wyrm via "virtual age categories" rather than just via adding hit dice. The "virtual age category" progression is a refinement and update of rules for doing so that were put forth in the Epic Level Handbook.

It's worth noting though that that is an optional manner of progression. As intelligent creatures, Dragons can progress by taking class levels just as a bugbear or human might, or can continue to take Dragon hit dice in a manner similar to any other creature progressing in their racial hit dice. (The dragon's hit dice are outlined on page 308 of the Monster Manuel.)