Anyone who stops learning is old,

whether at twenty or eighty. Anyone who keeps learning stays young.

无论是二十岁还是八十岁。坚持学习的人永远年轻。

say as they get older they get more stubborn and set in their way of thinking.

总说自己年纪越大就越固执，越固守成见。

I find as I get older I learn more and as I learn more I realize there is always soo much more I need to learn-new discoveries/inventions/technologies/illnesses/cures, etc.

我却觉得，随着年纪增长，我学到了更多；而我学得越多，就越意识到自己需要学习的东西还多得很——新的发现、发明、技术、疾病、疗法等等。

know it all and don't bother to think otherwise. Kinda' like how some old people were stubborn to adopt cell phones, computers.

什么都懂，根本懒得去想其他可能性。有点像有些老人固执地不肯接受手机和电脑那样。