Have I become a cranky old lady?

I live in an tree-lined, relatively quiet urban neighborhood. Most of the houses are single family, owner occupied. Lots of front porch sitting at all times, the houses are close together. Multi-age families, everyone knows everyone else.

My next door neighbor (who is one of the few renters) is on vacation and has his younger brother house sitting for the dogs. As one might expect, the younger brother is taking advantage of house sitting, and has invited about 12 people over. It’s now 3:30 am and they have been out on the front porch since 11:00 pm drinking and talking extremely loudly. The noise is enough to wake me, and prevent me from falling back asleep. I wouldn’t mind the voices so much, but someone keeps slamming the front door every time they close it, and it wakes me back up. I am getting a headache.

Am I being an unreasonable grouchy old lady? Should I say something to them about the noise? Or do I let it go, and get even by mowing the lawn at 8 am tomorrow?