When do females and males stop mutring

If you meant moulting (the process of shedding an old exoskeleton or skin and growing a new one), then:

• Moulting is a process primarily associated with arthropods (like insects, crustaceans, and spiders) and some other invertebrates.
• In species that undergo moulting, it is typically a stage of development that occurs throughout their life cycle, from juvenile to adult stages.
• There isn't a specific age or point when females and males "stop" moulting in the way that, for example, humans stop growing taller. Instead, moulting often ceases or changes significantly once an individual reaches its final adult form or reproductive maturity, especially in insects where the final moult leads to the winged adult stage. Some species may continue to moult throughout their adult lives, while others do not.

If "mutring" refers to something else, please clarify the term.