一、One is never too old to learn的意思是：活到老，学到老
二、例句：
as the older mentioned, one is never too old to learn.
正如这位长者所提及的，活到老，学到老。
三、常见英语俗语：
1. A bad beginning makes a bad ending。不善始者不善终。
2. A bad compromise is better than a good lawsuit。吃亏的和解也比胜诉强。
3. A bad thing never dies。坏事遗臭万年。
4. A bad workman always blames his tools。拙匠常怨工具差，不会撑船怪河弯。
5. A barking dog is better than a sleeping lion。吠犬也比睡狮强。
6. A bird in the hand is worth two in the bush。一鸟在手胜过双鸟在林。
7. A boaster and a liar are cousins-german。吹牛与说谎本是同宗。
8. A book that remains shut is but a block。有书不读，书变木头。
9. A bully is always a coward。色厉内荏。
10. A burden of one\'s choice is not felt。爱挑的担子不嫌重。
11. A candle lights others and consumes itself。蜡烛照亮别人，却奉献了自己。
12. A cat has nine lives。猫有九命。
13. A cat may look at a king。小人物也该有权利。
14. A close mouth catches no flies。病从口入，祸从口出。
15. A constant guest is never welcome。常客令人厌。
16. Actions speak louder than words。事实胜于雄辩。
17. Adversity leads to prosperity。穷则思变。
18. Adversity makes a man wise not rich。逆境出人才。
19. A fair death honors the whole life。死得其所，流芳百世。
20. A faithful friend is hard to find。知音难觅。
21. A fall into a pit, a gain in your wit。吃一堑，长一智。
22. A fox may grow gray but never good。江山易改，本性难移。
23. A friend in need is a friend indeed。患难见真情。
24. A friend is easier last than found。得朋友难，失朋友易。
25. A friend is never known till a man has need。需要之时方知友。
26. A friend without faults will never be found。没有十全十美的朋友。
27. “After you” is good manners. “您先请”是
礼貌用语。
28. A good beginning is half done。良好的开端，成功的一半。
29. A good beginning makes a good ending。善始者善终。
30. A good book is a good friend。好书如挚友。