[Wirt doesn't often have reason to bust out the fact that he's older than Dipper and Mabel, but...now and then it just comes up naturally.]
What, does he think he's too old to dress up for Halloween or something?
[This clearly isn't an issue in Wirt's teenage years, seeing as he not only dressed up for Halloween but then proceeded to wear said costume for a year afterwards while stuck in another dimension.
...Alright, maybe Wirt's not the best example, but he still thinks it's a little funny that Dipper thinks he's too old for it.]
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What, does he think he's too old to dress up for Halloween or something?
[This clearly isn't an issue in Wirt's teenage years, seeing as he not only dressed up for Halloween but then proceeded to wear said costume for a year afterwards while stuck in another dimension.
...Alright, maybe Wirt's not the best example, but he still thinks it's a little funny that Dipper thinks he's too old for it.]