I assumed that was in an attempted to identify the tank's source.
Claims for life average expectancy for white males vary with sources today from 73 years to 83 and I don't know who to believe. I've known divers older than I am, today 76, but very few. Last summer at 75 I was debating scuba retirement when I was hit by a series of problems that kept me hospitalized for three months and even today after extensive healing and therapy I wouldn't put a tank on my back - certainly not with enough lead to dive my 7 mil suit. Some Sexagenarians are tougher than others but I'd suggest limited expectations. One fellow I knew who was older than I but seemed tougher than I am dropped dead last month.