No, a senior apartment isn't an old-aged building. A senior apartment is an apartment built specifically for senior adults. Senior apartments feature senior-specific amenities and facilities in a shared community with other similar adults.
Generally, yes, you need to be a senior to live in a senior apartment. However, some senior apartment communities do have differing standards. That doesn't mean you can't ever be visited by anyone under senior-age.
Most senior apartments allow for short-term guests to visit for a matter of hours or days at a time. Again, the regulations can vary quite a bit from one senior apartment community to the next.
So, what exactly is it that sets a senior apartment apart? Here are some of the most common features designating a senior apartment:
Senior apartments are typically very well maintained and feature-rich, as it's intended for residents to live much of their life on the apartment grounds. Senior apartment communities have many on-site businesses and attractions to visit and usually have plenty of comfortable and well-maintained common space.