Washington [US], September 17 (ANI): Singer-songwriter and actor Demi Lovato talked about her latest documentary ‘Child Star’, and discussed the process of ageing and how much it affects her mentally, reported People. “Aging is something that, if I think too hard about it, I can get anxiety about — not because I’m worried about how I look or the changes in my body or my face, but because of that existential dread,” shared Lovato, who will make her directorial debut with the documentary. “I like to stay in the present moment. When we think about things that are in our past or things that are i…