Tipping Point

At what stage of life do you start to use age as an excuse, or even a badge of honour? I am conscious of the fact that I included my age in the profile for this blog. I am not sure why, it just seemed relevant. Was that saying: Look even a 57 year old can do this? Or was it an insurance in case I don't complete the challenge, like: Well, what else could you expect?

A 40 year old wouldn't use his or her age as a safety net. So where is the tipping point?