There are
three reasons/purposes to calling/texting a girl:
Your message should work towards a date. Whether a D2, D3, or other, you should be focused on moving the interaction forward. Seed your D2s, try to get at least one phone call in so she knows that you're real and not just a serial texter.
Your messages should give you presence. She meets you at the club and gives you her number. She WANTS you to message her. But you don't message her for a few days...by then, she's chatting with other guys...while the heat she has for you gets cold. Use texting to spike her buying temperature and keep you in her mind, especially after you've locked in a date.
Your messages should sexually escalate. Most guys (admittedly, me included) get into running text routines which, while fun, don't move the interaction towards sex. So eventually you'll have to push yourself out of your comfort zone, start sexting/phone sex/asking for dirty pics/etc. There are a lot of great resources here by Taz, Science, Maestro, and others on how to properly turn a text message dialogue into a sextual conversation...
From the text example you gave, it sounds like you do a lot of the second one, BUT remember: your first and foremost goal is to lock her into a date because without a date, you're simply messaging back & forth and slowly placing yourself in the friendzone.
And even then, like Ice said, your texts are boring; they sound like stuff that friends say to each other, not what guys who know how to turn girls on say...
Also as Ice said, texting has to be very fluid, although the flowchart gives you a guideline to keep you on track to make sure you remember to move towards seeding and locking in the date!
What to text? Lots of great lines and examples can be found if you look through the archives.
Here's a great bunch of them. Simply plug and play into the flowchart.
As for the age objection, if she brings it up, it's only a big deal if you make it a big deal, and there's a lot of ways to deal with it. As a guy who's in his mid-30s and last two exes and current gf is in their 20s, here's my favourite way of dealing with it:
HB: How old are you?
You: Guess...
HB: I dunno...30 / I don't like guessing
You: I have a rule, you're only as old as the last girl you kissed/fucked/cuddled with...so I'm 23
A few guys here say, "I'm old enough to do it right, young enough to do it all night"
