It's raining men
The 'excess' men in their early 30's I am almost sure an artifact of the populations incarcerated in the jails located within the city proper. The local jail population is something like 90% or more men I believe. For those in their early 20's the dearth of men is likely a reflection of the greater number of women in college here these days. I actually think that ratio would be more pronounced except that it appears to be offset by the jail demographic for the 20 year olds. Then in the older ages you see the clear health impact as women outlive men.