Texstyle, I have a very small chest - 34A - so I'm not really worried about chest-area exposure. This one is quite open at the top, but that works for me.
I'm 51, and for the last few years I have looked for a one-piece at the beginning of the season, and have even purchased a few, but they never worked for me. One made me feel matronly, and one had the dreaded boyshort bottoms. I have had tankinis -- mostly when my girls were little, because they are so easy to play in. But for me, they're not right for the look and feel I want now. So I stuck with my bikinis.
I don't mind my bikinis and like them for sunning and vacationing, and I like my body, but you know, the midsection doesn't get better each year no matter how much I work on it ... and basically, I wanted a suit that had some sex appeal but would also let me stop thinking about how I look when I walk along the beach in my hometown. I'm not one of those people who lays down and reads on the beach (although I am a reader). I can read for a bit, but I'm a bit antsy at the beach -- I usually end up walking the full length several times, just to stay active and to not feel like I am roasting. I'm really looking forward to doing that and not worrying about my tummy.