How to use "at" to indicate age?

Question

I found the following sentence in a movie. Though, I can understand the meaning without difficulty, I cannot understand the grammar completely. This is mainly down to the fact that they have used "at" to talk about an age. Therefore, I would be grateful if you could let me know why they have used "at"; if I were going to write something like that I would use "in" instead - is it okay to use "in" instead of "at" to gain the same meaning in this sentence.

In addition, frankly, I find it a bit difficult to use prepositions like this appropriately; therefore, could someone please give me some websites on which I could acquire knowledge about this subject.

Mother: Teen pregnancy waiting to happen.
Daughter: You had me at 19.

Clive · Accepted Answer

Prepositions used in time expressions are difficult for learners of English, as they are rather idiomatic.

Here is a link that may be of help to you.

https://www.englisch-hilfen.de/en/grammar/preposition_time.htm

Mother: Teen pregnancy waiting to happen. >>> This is far from a compete sentence.

Daughter: You had me at 19. >>>This means 'You gave birth to me at the age of 19. Or you could say 'You gave birth to me when you were 19

See definition 6b, quoted here from the Merriam Webster dictionary.

Definition of at

(Entry 1 of 7)

1 —used as a function word to indicate presence or occurrence in, on, or near staying at a hotel at a party sick at heart2 —used as a function word to indicate the goal of an indicated or implied action or motion aim at the target creditors are at him again3 —used as a function word to indicate that with which one is occupied or employed at work at the controls good at chess4 —used as a function word to indicate situation in an active or passive state or condition at liberty at rest5 —used as a function word to indicate the means, cause, or manner sold at auction laughed at my joke act at your own discretion6a —used as a function word to indicate the rate, degree, or position in a scale or series the temperature at 90 at firstb —used as a function word to indicate age or position in time will retire at 65 https://www.merriam-webster.com/dictionary/at

How to use "at" to indicate age?

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