in my age vs At my age

Some examples from the web:

• I know it pretty well that, ...in my age
• In my age, monsieur, one is never well.
• Honestly, I think you keeping me from finding a real... Swedish friend in my age.
• Do you know at home how many girls in my age get rid of their babies instead of keeping them?
• It is in my age and has no wife or children.
• In my age an hour counts like a whole year.
• I'd rather be in my age than in 2015 being miserable.
• There aren't a lot of single men in my age range,
• What did you do when you're in my age?

Some examples from the web:

• At my age, I look at the truth straight on.
• At my age, there's not much eventually left.
• At my age, nothing worries me.
• At my age you don't sleep much anyway.
• At my age working for a foreman 30 years younger than me.
• At my age, a beauty isn't enough.
• At my age, it scares me.
• At my age, sometimes you lean forward and suddenly your head is in another reality.
• At my age you do nothing more concerned about it.
• At my age, I need it.
• At my age, legs betray you.
• - At my age you tend to forget.
• At my age, a little excitement is welcome.
• At my age, events become...
• At my age it was a shock.
• At my age you can sense these things.
• At my age, most folks have a nice setup on good old Earth.
• At my age, corrected by an illiterate.
• At my age, I don't smoke so much.
• At my age, one has to learn from other people's experiences.