Enjoyable topic to think about. I experience character as fixed, despite my attempts to change it over 71+ years. I gave that up a while ago and instead decided to focus on my virtues while corralling my faults (rather than eradicating them). For example, I can be rude on a line, or a phone call. I blame being born in Manhattan where brusque quick interactions are considered polite as opposed to time wasting niceties. This has not gone over well in the rest of the country! So I accept I may be rude, but instead focus on expanding my natural friendliness. This has mostly improved things! That is, instead of telling myself "don't be rude" I tell myself to let out my genuine interest and friendliness. That said, I agree we are never too old to be our better selves as often as possible. Thanks!