[nickd2001]

As someone who's had kids at a similar age to you, yeah its not a nice thought not being around for them as long as you'd like to be. Especially the thought of them having lost their parents when still relatively young (e:g in their 30s). Your life expectancy estimate sounds possibly a little pessimistic to me. With modern healthcare, barring bad luck, trying to live to 85-90 might be not a crazy ambition? That'd involve being somewhat focused on not eating cr*p and trying to get a decent amount of exercise, nothing crazy but just a little bit of prioritisation. That's my approach anyway. I wonder if in time older parents will be found to have longer life expectancy because they have an extra incentive to look after their health?