making her feel emotion:

i once met this girl who said she felt old because she was turning 20(i'm 19). I then went on this whole rant on how young she is, how we have our whole lives ahead of us and how there's so much we can do and feel and see and change. it was pretty inspiring and she's kinda reacting to me differently and i think it's because i truly made her feel alive and it's such an honest emotion. idk i realize not all girls feel old but all girls do try and find problems(even when they shouldn't have any) and the key is to turn that to your advantage, not in a negative way but in a positive way like helping her, motivating, making her feel. idk.

Hello my friend, you have done a great job.She is very honest to you. And remember this honesty should be from your side also.Because this will make your relationship more and more stronger and long life in future.

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Don't see a problem there, I think you have handled that excellently.
1 year age difference is hardly anything to worry about, but you can tease girls with it if they don't have a problem with age difference....
Is she a year or more younger? :p Tease her with her being immature
Is she the older one but not walking with a cane yet? Well be very very very careful making jokes about that;)

I'd like to go over the top with comments so there is no way they can take it seriously.
Tell a girl that's 1 or 2 years older that you still struggle with the idea that she will get older earlier and that you would really mind if she starts balding before you or whatever;)

Although that wasn't your question, I hope you don't mind how I would act in such an situation

An awesome thing to realize, man. Excellent job! This is one thing that I think a lot of PUAs forget sometimes: we sometimes compartmentalize either playing game, or "leaving her better off", when if we are doing one correctly, we will be doing the other well, too.

Depending on what you are looking for, I disagree with the posts above:

This is bullshit, of course 20 years is not old! She knows that!! This is so obvious, she expected that the other will comfort her and telling that she is still young?! By 'comforting' her, you were seeking rapport with her. This is no potential lover behaviour. You are pleasing her. She can lay back, and wait till you do everything to make her comfortable.

It is like a HB10 with a hot figures, says she is fat. She knows herself that she looks hot, but she want you to tell her she is slim. It's that easy!

Congratulations, you have qualified yourself als mr. Niceguy!

as said before, depending on what your goals are:

1. friendship? You succeed and i rest my case
2. Lover? You fucked up!

Come on, she is f*cking 20!!!!!!!!!

She may very well have been joking or seeking validation. But also may simply have some sort of weird insecurity. We can't know because we haven't seen her. And based on the post, he seems to have built some good comfort with her. PUAs don't always have to neg targets. Sometimes the target is having a bad day, and NEEDS some validation. Seeing into what the woman needs helps bring her to you better.

Honestly, I probably read way too much into this, but it seems to me like it was really bugging her. Now there was someone with a comment above me saying you messed it up by giving her validation.

I do not agree. Sure you need to neg and tease a girl to get better results but there is no need to neg her when she tries to have a serious talk with you, even if it's about something you think is retarded or delusional.

Pick your battles. Neg her about her stuffed animals she still keeps on her bed. Or silly pictures of her when she was younger. Just keep it light and playful.

If you are going to neg her when she wants to discuss something, you'll be excluded next time she has (in her eyes) important she wants an opinion on.