You would probably be older than most in the Redmond urban center. It is internationally diverse. Has hard working professionals energy. People are free with the friendly waves and smiles, which suits me.
Redmond Ridge is further out from Seattle, older demographic, very safe, walking trails, a couple of 55+ communities, a large grocery store, several restaurants. I don't know how many rentals there are but there are some townhouse communities that probably have some.
Someone mentioned West Seattle, where I grew up. It somehow has maintained its charm (unlike me!). Part of Seattle proper, it is on a peninsula which gives it a separate small town feel. Self-contained except no hospitals. It is pretty safe, and good for urban hikes with hills. There is age diversity, and amazing Alki Beach, also Lincoln Park is there, so two of the too rare parks on Puget Sound. People are happy to be living there and have that kind of friendliness (aren't WE lucky).
I should mention, the past several summers we've had problems with smoke from wildfires and are currently experiencing that (here in Redmond), depending on which way the wind blows. It is hard on people with any kind of breathing issues and can go on for days if not weeks. I guess this can happen anywhere in the western states.