When writing a notice, focus on the nature of the activity and the physical demands required, rather than directly mentioning age limits. Here's an example of a possible notice: --- Dear Team Members, We are excited to announce an upcoming dynamic team-building event! This event will be themed around outdoor adventures, including high-intensity physical activities such as hiking and rock climbing, designed to challenge oneself, enhance cooperation, and inspire team energy and passion. Due to the high intensity and physical demands of the event, we recommend that members who are confident in their physical abilities and are keen to challenge their physical limits sign up to participate. This will be a great opportunity to enhance team cohesion and exercise personal abilities! Looking forward to your participation, please sign up before [date] so that we can prepare accordingly. Thank you for your understanding and support! Best wishes, [your name] --- This approach makes the criteria for participation physically oriented rather than age-oriented, thus avoiding possible sensitivity.