We have 42 active Los Angles class hunter-killer submarines

[HooptieWagon]

70. A thoughtful rational post, as usual.

The most recent LA class sub was launched in the mid nineties. However, the earliest were launched in the early seventies (went into service in the mid-seventies)... so even though the newest are about 16 years old, the design and technology is from the late sixties. And, as you and others have noted, the LA class doesn't have accomodations for women sailors and officers.
How many is always going to be a debateable question. Each Carrier group is going to need 4 subs for anti-sub protection. Several subs will be needed to patrol at shipping bottlenecks... Denmark Straights, Straights of Hormuz, Black Sea straight to the Med, etc. Several subs will be needed to tail Russian and Chinese missle subs. And of course at any time, several subs will be in port for reprovisioning, repair, or overhaul. Pre-WW2 the US had about 110 subs, by my count. Currently we have 52. Although the new subs are faster and stay at sea longer, that still seems to be cutting things a bit thin.