My grandfather died of colorectal cancer at age 72, I´ve read the average age of screening is at 50, but should I get screened earlier? (22 yrs old)

Yes ACS Guidelines. The American Cancer Society (ACS) guidelines place you in the increased risk category for colorectal cancer or adenomatous polyps if you have any first-degree relative aged 60 or older with either condition. They recommend a colonoscopy starting at age 40.
Consider. no need to worry. I would consider starting in your 40's.