Low LH Surge

This is my first month using an OPK. I never got a very dark second line on my tests, but the chart shows a very distinct peak and drop. Any ideas on what this means? Did I still ovulate? I am 40 years old, so perhaps age is a factor. My cycles range from 26-32 days, so I think I’m past the point of any future ovulation during this cycle since I’m on CD 19.