Synonym: abandoned, aged, ancient, antique, elderly, former, mature, obsolete, outworn, stale. Antonym: new, young. Similar words: fold, hold, odd, add, aid, all, and, bad. Meaning: [əʊld] 
n. past times (especially in the phrase `in days of old'). adj. 1. (used especially of persons) having lived for a relatively long time or attained a specific age 2. of long duration; not new 3. (used for emphasis) very familiar 4. just preceding something else in time or order 5. of a very early stage in development 6. old in experience 7. belonging to some prior time 8. (used informally especially for emphasis).
n. past times (especially in the phrase `in days of old'). adj. 1. (used especially of persons) having lived for a relatively long time or attained a specific age 2. of long duration; not new 3. (used for emphasis) very familiar 4. just preceding something else in time or order 5. of a very early stage in development 6. old in experience 7. belonging to some prior time 8. (used informally especially for emphasis). 
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1 The old goose plays not with foxes. 
2 You can't teach an old dog new tricks.
3 Old birds are not caught with new nets.
4 An old dog will learn no new tricks.
5 Don't put new wine into old bottles.
6 It is never too old to learn.
7 No fool like an old fool.
8 If the old dog barks, he gives counsel.
9 No fool to the old fool.
10 There is life in the old dog yet.
11 There is no better looking-glass than an old friend.
12 Never too old (or late) to learn.
13 If you wish good advice, consult an old man.
14 An old physician, and a young lawyer.
15 As the old cock crows, the young (one) learns.
16 Old acquaintances will soon be remembered.
17 An old dog cannot alter its way of barking.
18 The devil knows may things because he is old.
19 Economy is the easy chair of old age.
20 Need makes the old wife trot.
21 Whoso learns young, forgets not when he is old.
22 A young man idle, an old man needy.
23 Trust not a new friend nor an old enemy.
24 There is no fool like an old fool.
25 A man [one] is never too old to learn.
26 An old dog barks not in vain.
27 There is no fool to the old fool.
28 There's no fool like an old fool.
29 Spare when you’re young,(www.Sentencedict.com) and spend when you’re old.
30 Familiar paths and old friends are the best.