If you are looking for "mature" content creators (older adults or those with a more mature style), community recommendations from platforms like Reddit's r/letsplay include:
If you are trying to play games that are locked due to maturity restrictions, you can adjust these in your account settings. This is often necessary for players who are 13 or older but are still blocked from "Moderate" or "17+" content. : matures playing
Can’t edit or download my own game anymore due to content maturity If you are looking for "mature" content creators