I don't think so. Sure more older people commit than younger ones, but that's because life is getting generally more shit as you get older, I don't think it's bc it gets easier mentally for older people. I think my si is harder to overcome now than when I was younger where I did actually attempt, as opposed to now where I am stuck in limbo. When you are a teen you have all the hormones acting crazy, the body has less experience of being alive so it doesn't cling to life as much, you have more energy to act, you are more reckless and impulsive and you don't think everything through.