Over-tourism and photo-seekers have been damaging the world's most beautiful places, and even causing some to close to visitors entirely
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  It can be specific or broad, and it can be aimed at a particular type of person based on your experiences (e.g. people in my city, people with fibromyalgia, etc.) or just people at large.
Also, given that age is a very identifying piece of information, feel free to give a range if you're not comfortable sharing your exact age (e.g. "I'm in my 40s" rather than "I'm 42").