At the moment, DH is 53, son is 29 and son-in-law is 28. If DH came to blows with either of them, he would win. He's still very strong and he's heavier than both of them too. I'm watching my Dad decline considerably, he's gone from being a very strong man to very vulnerable, and it's been so gradual, that I can't pinpoint when that cross over happened. Just musing really, when is that switch over when men of son and SIL's age become the stronger ones, and the older one (DH) moves into the elderly/weak category?