Conflicted with age gap

Her and I are 28 and 51. We met online seven years ago, and it remained online due to circumstances, however the only problem is I didn't find out she was in her 50s until about two years ago. I previously believed her to be in her mid 30s, and she lied due to going through hard times and not wanting me to lose both me and another loved one. I love her to death, we have amazing chemistry, and we get along amazingly... but am I an asshole for feeling uncomfortable about the gap?