Ability Score Increase. Your Constitution score increases by 2, and one other ability score of your choice increases by 1

Slimefolk don't have a physical maturity per say and by other creatures standards, they are born physically matured. However, a slimefolk will take at three years to reach mental maturity beyond that of the standard behavior most oozes exhibit. As far as lifespan goes, slimefolk are not known to have one. Given their absence of recording their history and other races' disinterest in them it makes it hard to say how long a slime folk can or will live, their bodies not showing any signs of age or decay. For reference's sake, the oldest known slimefolk lived to be as old as an elf before perishing at about 700 years old.

Slimefolk, despite some saying they naturally bend towards chaos and evil, tend towards no particular alignment. Rather, they adjust to the alignment of the society they are in. When they do form groups with other slimefolk, they tend towards the lawful neutral alignment, however, this is more of a structure for social cohesion more than a tenancy towards following rules.

Size. Slimefolk vary in size, and even individual slimefolk can change their size by taking in or expelling water from their bodies, but in general, slimefolk are comparable in size to most other intelligent races. Your size is Medium.

Dehydration-Prone. You are composed of a large amount of liquid and as such, you fare poorly in the burning environments. You have disadvantage on saving throws against Extreme Heat

Dilution. For slimefolk, water is both an essential part of life and a death sentence. If you start your turn in a body of water, such as a lake, an ocean, you take 1d6 necrotic damage at the start of each of your turns. Rain is similarly harmful, but only inflicts 1 necrotic damage per turn. If this damage reduces you to less than half of your maximum hit points, you are considered to be poisoned until your hit points are restored to over half your hit point maximum.

you gain +1 AC

on a natural one to hit you can make the attack bounce back for half damage