tl;dr A firm
NO to living next to a pool or on the corner of a feeder street. Construction will end eventually and should end much quicker if the community is being built by a company with sufficient financial resources.
We're not in a 55+ community, but I can offer a bit of relevant info on our experience. In 1996 we built our house on the corner of a cul-de-sac street at what was
then the last edge of a new development. The traffic that regularly passed by our house was mainly from the residents of our street. 2 years later they built a house on the last empty lot directly across from us and started tearing down trees to extend the street through. We lived right on the edge of a construction zone for a year or 2 after that with all the associated hammering, banging, and rumbling of heavy construction equipment being driven down the road right next to our house starting at 7 AM in the summer. Even when the building got further away from our house, the road beside our house was the only through street in the development to use to bring in their heavy equipment. During the financial collapse around 2009, construction came to a halt. Lots stood empty for several years. A sure sign that things had finally turned around was when the construction equipment started rumbling past our house again. In the meantime though, the local noise ordinance had changed to no noise before 8 AM, so at least it didn't start quite so early. They finished up building on all the lots in 2017.
That's 21 years of building, with a few years hiatus because of the last economic collapse.
Granted, the local builder in charge of this development hasn't got deep pockets like the larger national/regional builders. In contrast, a larger developer is putting up houses in a brand new 55+ community just a 5 minute drive away. They're going up faster than you can blink and construction on them continued when most other businesses had to shut down in the spring.
I don't have construction equipment passing right by my house anymore, but since we're more towards the beginning of the development now than the end of it, we get a lot of residential traffic passing by all throughout the day. What seemed like it would be a quiet corner in the beginning has turned out to be anything but that for us, since our corner is what I think is referred to as the feeder street for the rest of the development. They never built another through street. Sure, it's not like living on a main street, but it's a far cry from only having traffic associated with your street neighbors passing through. Live and learn.
About pools - When we chose our lot, we didn't know that the neighbor diagonally adjoining in back ran a daycare out of her home.
How could we? She has no sign advertising it. She had an above-ground swimming pool behind a privacy fence, but so do other families around here for their personal use. After we moved in, I became quite aware of all the excess of noise coming from her house in the summer. A few years later, she replaced the pool with a huge in-ground pool. Bigger pool, more kids, and she expanded her hospitality to include local teenagers using her pool during the summer. All. Day. Long. With a weekend or two where she'd allow late night swimming. Until recent years, it's been like living right next to a local municipal public pool. The difference now is that she's taken in fewer kids, mainly because of the aging of the neighborhood. Most of the kids in the neighborhood are now young adults. So the noise level from her house has gone down quite a bit, thankfully. She's a nice woman and she hasn't violated any local noise ordinances, so it's just something we've had to put up with since living here.