Ask Amy: Extrovert stresses he is not a stalker

Dear Amy: I’m an outgoing 67-year-old man.
I regularly speak to strangers I meet on the street, in stores, elevators, etc. I frequently walk my dog in the neighborhood.
On a recent jaunt, I ran into a female neighbor 40 years my junior, whom I know only casually. Having seen her jogging in the past, I noticed that she had lost weight.
On this occasion, I questioned whether she had indeed lost weight and when she said she had, I complimented her on how well she looked. I congratulated her.