It's not uncommon for parents to take care of their children's chores, including laundry, especially when they are younger and still living at home. However, by the ages of 22 and 20, it is generally expected that young adults should be capable of doing their own laundry and managing basic household tasks.
Teaching your children how to do their own laundry is an important life skill that will serve them well as they grow older and become more independent. Doing their laundry for them may inadvertently send the message that they are not capable of handling such responsibilities.
By now, it's advisable to start gradually involving them in the laundry process and showing them how to use the washing machine and dryer safely. Start with simple instructions and supervision, and over time, let them take more responsibility until they can do it independently.
Encouraging independence and teaching life skills is an essential part of parenting, and it will help your children become more self-sufficient as they transition into adulthood.