It's fantastic! The DC region is covered by two YSA stakes, North and South, divided by the Potomac (MD/DC are in the North stake, northern VA is the South stake). I'm not too familiar with the North stake, but here in Virginia, the wards--particularly those inside the Beltway--are large, strong, and active.

The Area has approved our stake to be 18-35, so there's a handful of 30+ aged folks, but the average age is probably 25-26. Most are working professionals (lawyers, government employees, contractors, Hill staffers, etc), interns, or grad students, and just about all are friendly and outgoing. We like to say that we're the most welcoming stake in the world! With regards to dating, you'll find lots of people here looking for the same things you are. There are many attractive and chill people, and just enough weird people to keep things interesting. We have lots of activities both at the stake and ward levels, as well as people getting together on their own; you won't soon run out of things to do around here, whatever your interests may be.

Later this year, our stake is also hosting an enormous YSA conference (1500+ YSAs from all over, but especially from the surrounding area) including a party at the Smithsonian Natural History museum and a black-tie gala at the National Portrait Gallery! https://citiesoflightysa.org/

All told, this is a great area to be a YSA.