Yes, it doesn't explicitly say it in the article, but since he mentions he has run 40+ iron mans (iron men?), he has probably been doing it for at least 20-25 y

Yes, it doesn't explicitly say it in the article, but since he mentions he has run 40+ iron mans (iron men?), he has probably been doing it for at least 20-25 years. So he probably started in his 40s at least, and I'm going to guess he was fitness oriented even before that. Random 70 year olds shouldn't necessarily take his advice on how to get off the couch and complete an iron man, though most of it does seem good.