It's not uncommon for parents to continue helping with their children's chores, including laundry, even when they have reached adulthood. Every family dynamic is different, and there's no strict definition of "normal" when it comes to these arrangements. It depends on cultural norms, family traditions, individual circumstances, and personal preferences.
Some families believe in fostering a strong sense of independence from an early age and encourage their children to take care of their own chores, including laundry, as they grow older. Others may continue to provide support and assistance with household tasks, including laundry, as a way of showing love and care.
If you and your mother are both comfortable with the current arrangement, and it works well for your family, there's no need to worry about whether it's "normal" or not. What matters most is that the arrangement is mutually agreeable and respects the boundaries and dynamics within your family.
If you feel ready to take on more responsibility, including doing your own laundry, you could have a conversation with your mother about it. Express your gratitude for her help and let her know that you'd like to start taking care of certain tasks on your own. This can be a step toward greater independence and self-sufficiency.
However, if you prefer the current arrangement and it works well for both you and your mother, there's no need to change it if you're both happy with it. Remember, every family is unique, and as long as everyone involved is content with the arrangement, there's no one-size-fits-all answer to what is "normal."