Age is not measured by years. Nature does not equally distribute energy. Some people are born old and tired while others are going strong at seventy.
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When I was younger my whole sense of self-worth was based on whether or not I was working which was awful. And I had a baby at 20 years old so it wasn't just about me. At around the age of 30 there was a stretch where I wasn't working – certainly not on anything I liked anyway – and I started to do other things.