Your dexterity increase by 1. Your constitution score increase by 2.

Skeletons do not have a set age but are normally brought back after adult hood.

skeletons size are based upon the size of the creature that there skeleton comes from

Your base walking speed is 30 feet.

you fall into a pile on the ground putting you prone, but it increases stealth. you can also choose parts to individually fall off. 

you attachment extra limbs to your body, but only one at a time.
Skull (proficiency in intelligence saving throws)
leg (gain extra 5th feet of movement) 
ribs (gain an extra 1 ac)
Arm (be able to manipulate items, and perform an unarmed strike)
fingers (gain a plus one to hit)
you can swap body parts mid encounter with the cost of an action, this will remove your other body part. ( if you have to limb on you)

you are unable to breath so you cant drown but with cant use items based on blowing wind though them.
(you can still speak)

due to it but it being much harder to pierce bone you gain resistance, but due to no flesh to pad you are venerable to bludgeoning damage.

You can speak, read, and write Common and one extra language of your choice. Humans typically learn the languages of other peoples they deal with, including obscure dialects. They are fond of sprinkling their speech with words borrowed from other tongues: Orc curses, Elvish musical expressions, Dwarvish military phrases, and so on.