Erm im the oldest
& my & my brother have the same humour in fact spark each other off - so would say the same really & he's over 4 yrs younger than me. As for my kids they both have their moments, the oldest has dry humour & my youngest is just a jester, so its laugh a min here
Luckily no sence of humour bypass here
I think that oldest does naturally hold the most responsible role, meaning they are relied on most by independance, plus they are ones to test pilot doing well or getting done whereas younger ones see the loopholes or the mistakes the older sibling has done even getting away with murder as my brother enlightened me on this matter