Cat Dragon ages are not well documented, they can live anywhere from 12 - 1200 years.

Cat Dragons are tiny sized.

You have a walking, climbing and flying speed of 60 feet.

You speak Common, Draconic, and 1 language of your choice, you also can speak to other animals.

You have a +2 to Dexterity and Charisma.

You have proficiency in Animal Handling, Acrobatics, and Nature.

You have advantage on Nature and Animal Handling checks.

Cat Dragons eyes are keen and trained as a result of a lifetime of danger as a tiny hunter. You have advantage on Perception checks.

You have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have higher luck then most other creatures. You gain the Lucky feat.

You can use your claws to make unarmed strikes. When you hit with them, the strike deals 1d6 + your Dexterity modifier slashing damage, instead of the bludgeoning damage normal for an unarmed strike.

You have proficiency and expertise in the Perception and Stealth skills.

Your reflexes and agility allow you to move with a burst of speed. When you move on your turn in combat, you can double your speed until the end of the turn. Once you use this trait, you can’t use it again until you move 0 feet on one of your turns.

You have draconic ancestry. Choose one type of dragon from the Draconic Ancestry table. Your breath weapon and damage resistance are determined by the dragon type, as shown in the table.

Draconic Ancestry

You can use your action to exhale destructive energy. Your draconic ancestry determines the size, shape, and damage type of the exhalation. When you use your breath weapon, each creature in the area of the exhalation must make a saving throw, the type of which is determined by your draconic ancestry. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. You can use your breath weapon a number of times equal to your proficiency modifier per short or long rest.

You have resistance to the damage type associated with your draconic ancestry.

As a cat dragon you have advantage on saving throws against spells and other magical effects.

You gain the Control flames, Encode Thoughts, Mage Hand, and Message cantrips. Also at 3rd level you gain access to 3 out of the following 6 spells, Absorb Elements, Detect Magic, Disguise Self, Find Familiar, Hunter’s Mark, or Identify. At 4th level you gain access to 3 out of the following 6 spells, Alter Self, Calm Emotions, Dragon’s Breath, Heat Metal, Hold Person, or Vortex Warp. Lastly at 5th Level you gain access to 3 out of the following 6 spells, Blink, Catnap, Conjure Animals, Counterspell, Dispel Magic, or Fireball. Your spellcasting modifier for these spells is Charisma and can cast them a number of times equal to your proficiency modifier. You can also cast them normally if you have the appropriate spell slots available.