is this good for a 50 year old?

Yes, I have been using this religiously for 5 years. My dark circles were non-existent after a year of everyday use. This product took time but one bottle lasted me over 6 months. It is part of my nightly skin routine. I put it on first before applying another eye cream (which I also highly recommend - innbeauty extreme cream eye). I am 47 years old and I also have a cosmetology license that includes skincare education. Hope that helps!