When someone says "back in my day", when exactly did "their day" end?

Before electric lighting the day ended when the sun sets.

As I was a night owl my day started at 9pm. And ended at 7am when I got home from the night shift at a conveniece store.

From when the person was 21 to when they were 48.

When these ended :

Milk delivered to the door in glass bottles

Bread truck with home delivery

Dry cleaner door to door

Fruit sales like oranges door to door

Phone was party-line. (two longs and one short)

There were rabbit ears or antenna on the roof only TV ! !

Jets flew, over the speed of sound in USA

TV was in black and white

There was a “penny post card”

When they died.

When they were kids to teenagers to young adults.

When they were the age of the person they’re saying “back in my day” to.

Whenever they want it to.

Before there was an internet

Well, back in MY day every single person was always polite and respectful and everyone could even spel.

I think most people equate “my day” with when they were growing up. Of course that could be anywhere between what? … 5 and 20-ish?

When the next generation of kids were born & changed everything.

I suppose, one would be referring to when they felt they were at their prime.

^^ But when did it end is the question. I said it ended when they died because everything before that was “back in my day”.

^I feel it’s more subjective.
Especially, if one feels that they have or are declining in health.

I have to admit, I have never said “back in ‘my’ day.”
“Back in the day,” to me, has a spectrum.
There’s “back in the day” – “waaayyy back in the day.”
The longer I say “way,” the further back in time.

I wasn’t alive wwwwwaaaaaaaaaayyyyyy back in the day.

But. I remember way back in the day, when I trusted my government.

I may also add things like way “the fuck” back in the day.

Occasionally, I will say something was “back in your days.”

Some days, are just “not my day.” Or, in my life, not my year, not my decade, etc.

If I’m dead, I can’t say “back in my day.” So. Your context, is off.
Unless you are hearing me talk, through a Ouija (“weegy”) board.